python script to compare two database tables

Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. How do I import an SQL file using the command line in MySQL? I am trying to compare different databases and trying to figure out if the tables inside those databases are same/equal. If the Detect column insertion option is on, the most different columns are ignored. A simple test automation framework to compare two identical tables (share the same DDL) in SQL Server and report differences. In this case you require something more powerful that just Excel or Excel Macros, In the above example, we are joining the two data frames on a, DataComPy by default returns True only if theres a 100% match. When all is said and done there are a bunch of tables that should be identical. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. The reviewer just above me recommended Tom Kyte's GROUP BY method for comparing tables. set () . Highlight words: modified words are highlighted, Highlight lines: modified lines are highlighted. How to upgrade all Python packages with pip, How to drop rows of Pandas DataFrame whose value in a certain column is NaN. What should I follow, if two altimeters show different altitudes? @ypercube yes, I can confirm this. Create a python list of all values in table 2 using a search cursor. You signed in with another tab or window. To share the UI we can use PyInstaller. I wrote a package that generates the SQL for comparing two tables using this method. This code couldnt be simpler. Did the Golden Gate Bridge 'flatten' under the weight of 300,000 people in 1987? How do I merge two dictionaries in a single expression in Python? THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR It can receive all sorts of keyword arguments to select what to check for in the comparison (e.g. The time between the two queries is identical. You'll have to make sure it works on an extended dataset (hence the extensive comments so you can modify it). Quick way to validate two tables against each other Import Datacompy & Compare two dataframes, compare = datacompy.Compare( df1, df2, join_columns=acct_id, #You can also specify a list of columns abs_tol=0.0001, rel_tol=0, df1_name=original, df2_name=new), DataFrame Columns Rows0 original 5 71 new 4 6, Number of columns in common: 4Number of columns in original but not in new: 1Number of columns in new but not in original: 0, Matched on: acct_idAny duplicates on match values: YesAbsolute Tolerance: 0.0001Relative Tolerance: 0Number of rows in common: 5Number of rows in original but not in new: 2Number of rows in new but not in original: 1, Number of rows with some compared columns unequal: 3Number of rows with all compared columns equal: 2, Number of columns compared with some values unequal: 3Number of columns compared with all values equal: 1Total number of values which compare unequal: 5, Columns with Unequal Values or Types , Column original dtype new dtype # Unequal Max Diff # Null Diff0 dollar_amt float64 float64 1 0.05 02 name object object 2 0.00 01 qty float64 float64 2 3.00 1, Sample Rows with Unequal Values -, acct_id dollar_amt (original) dollar_amt (new)0 1234 123.45 123.4, acct_id qty (original) qty (new)5 1238 8.0 5.003 1237 NaN 345.12, acct_id name (original) name (new)0 1234 George Maharis George Michael Bluth3 1237 Bob Loblaw Robert Loblaw, Sample Rows Only in original (First 10 Columns) -, acct_id dollar_amt name qty date_fld6 1239 1.05 Loose Seal Bluth 29.0 1/1/20174 1237 123456.00 Bob Loblaw NaN 1/1/2017, Sample Rows Only in new (First 10 Columns) , acct_id dollar_amt name qty7 1240 1.05 Loose Seal Bluth 111.0, intersect_rows, df1_unq_rows, df2_unq_rows, intersect_rows compares all the columns of Matched rows and returns true if matched and False if unmatched. 565), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI, Comparing 2 functions for any differences in the result set. Can my creature spell be countered if I cast a split second spell after it? The Tolerance parameter defines a maximum number of differences that are allowed between two result sets. Divide and conquer - how about splitting tables into 10 smaller tables that can be handles by some commercial data comparison tool? At first, by which field(-s) your tables binds? Counting and finding real solutions of an equation. It is an option, it's what is being used for the ETL process, but the mustaches upstairs want a second opinion on if it worked or not so using SSIS to prove that SSIS got it right is not as convincing as dropping fancy words like CheckSum or MD5 Hash. We could then offer these headers as a potential key the user could select for the data comparison. This tool returns messages showing the comparison result. Has the cause of a rocket failure ever been mis-identified, such that another launch failed due to the same problem? PL/SQL reference manual from the Oracle documentation library. Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey. I was testing the use of. Connect and share knowledge within a single location that is structured and easy to search. The side-by-side mode has two panels, and the unified mode has one panel. I have 2 databases DB1 and DB2. Appreciated it. I assume you are wanting to be alerted if there is a difference. Then, we will select the source and target databases and provide a connection to those. I'm talking both schema and data. Making statements based on opinion; back them up with references or personal experience. description and name match. ON statement allows you how your tables bind. How to iterate over rows in a DataFrame in Pandas. How To Compare Two Dataframes with Pandas compare? See, Is this answer out of date? Compare database objects In PyCharm, you can compare two database objects of the same type. Generating points along line with specifying the origin of point generation in QGIS. Can you explain more clearly how you declare values for field 2 in your results table? Since you are a beginner you have automated tasks that can compare and sync the data that are available in Workbench,SQLyog,Navicat,Toad. A DataFrame is a 2D structure composed of rows and columns, and where data is stored into a tubular form. To report all differences, check on the Continue Comparison parameter. Additionally, we're adding three rows to the destination. Could you post your tables so I can take a look? But you can modify the script to satisfy your requirements. Comparing Python's Top Tools for Fuzzy Matching: PyFuzzy, FuzzyWuzzy, RecordLinkage, and RapidFuzz Data 4 Everyone! Annotate: select this check command to annotate the changes. When all is said and done there are a bunch of tables that should be identical. I assume these tables are much larger than shown. Is this plug ok to install an AC condensor? Why don't we use the 7805 for car phone chargers? IN NO EVENT SHALL THE How can I access environment variables in Python? Why refined oil is cheaper than cold press oil? A set of statements that you can use for writing migration scripts is generated in the Script Preview tab. Table Compare (Data Management)ArcGIS Pro | Documentation - Esri https://github. it's write that's some unknown problen has happenned, i was trying to set 9 or 8 in field1 and there are 50 in field, and when i'm writing 60 in field1 there is NULL value in Field2. Soft-Wrap: select this check command to have PyCharm wrap the lines of code, when the dialog is resized. Test Automation using Python - Comparing tables in SQL Server - LinkedIn Permission is hereby granted, free of charge, to any person obtaining a copy For example I have set it up has follows, Database 'a' has only one table called "abc" Python supports a module called filecmp with a method filecmp.cmp () that returns three list containing matched files, mismatched files and errors regarding those files which could not be compared. 565), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. Try different data diff tool - have you tried Idera's SQL Comparison toolset or ApexSQL Data Diff. Trim whitespaces: trim whitespaces if they appear in the end and at the beginning of a line (("\t", " ")). Select options that you want to ignore during the comparison. For anyone working in an analytical role, receiving requests to compare data will be all too familiar. If two lines differ in trailing whitespaces only, these lines are considered equal. It'd be fairly easy to read in the one table and do a lookup against the other. I realize that you already paid for RG but you can still use these in trial mode to get the job done ;). Effect of a "bad grade" in grad school applications, Using an Ohm Meter to test for bonding of a subpanel, Understanding the probability of measurement w.r.t. Creating Database:. Regular expression gives us a way to pattern match and extract information. How to Quickly Compare Data Sets IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, How do I set my page numbers to the same size through the whole document? What happens if the value of table1 is less than all values in table2? Objects are matched according to their kind and identity (for example, a function signature). But if you see my setup, database 'a' and database 'b' has only one identical Table and i expect it to print "True" BUT it prints "false" and when you compare database 'b' and database 'c', they are not identical because database 'c' has an extra table called 'xyz', so i expect it to print "false" which is correct. Simply find your file (ComPyUI.py in this example) and run the following command: pyinstaller --onefile ComPyUI.py The code Without further ado, simply copy the below code locally and run it for a comparison tool: (beware of more than one match which wont give the result that you expect). Unexpected uint64 behaviour 0xFFFF'FFFF'FFFF'FFFF - 1 = 0? How to compare two SQL databases from Visual Studio - SQL Shack https://github.com/BhanuAkaveeti/Python/tree/master/TableCompare. What is the quickest way to verify that those tables (on two different servers) are in fact identical. rev2023.4.21.43403. A technologist with domain expertise in Investment Banking, supportedextensions = ['csv','xlsx', 'xlsm' ,'json'], window = sg.Window('File Compare', layoutprefile), #################################################, #To align the three columns on the UI, we need the max len, #we need to split the keys to four columns, window2 = sg.Window('File Compare', layoutpostfile), It would be good if the CSV delimiter was to be defined rather than assume a , at the moment, Sizing of the window is too precarious, and using very long headers could create problems, Enable the system to remember key choices based on file names. Collecting data, working with data and of course comparing data. Or if video is more your thing, check out Connor's latest video and Chris's latest video from their Youtube channels. Thanks for contributing an answer to Stack Overflow! It only takes a minute to sign up. The script above will create two tables. How to use DataComPy. I searched for similar tasks but do not fully understand how to do it in Python. Can the game be left in an invalid state if all state-based actions are replaced? Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. To include all the changes that were excluded, click the checkbox near the Target label. And it seems to me that you use text (VARCHAR or same) type field with id. Migration is a process of moving data from one object to another (for example, from one schema to another). cursor.execute("UPDATE table1 t1") cursor.execute("INNER JOIN table2 t2") Thanks for your feedback:), no, that is one fully query: cursor.execute('update table1 t1 inner join table2 t2.'), Thanks for your feedback. When the tables have a different number of columns, extra columns in the table with more columns are ignored. Why do 59% of my Execution Plans have CONVERT_IMPLICIT warnings? If the option is selected, properties that are mentioned in the option are ignored in the diff. Likewise, if you wanted to share that piece of functionality with a non-technical person. Thanks to answers below for pointing me in the right direction. Yes, that way can be much more efficient. The primary key on the table is weird, however, as it's a composite key of 10 fields (it's an audit table). Once the two files have been defined, we should carry out some basic validation to ensure the two files are comparable. copies of the Software, and to permit persons to whom the Software is Compare fields of two tables and calculate field, How a top-ranked engineering school reimagined CS curriculum (Ep. I don't understand the logic you're using in your example excel table. Compare two database schemas to find missing tables, fields. To learn more, see our tips on writing great answers. If it is, please let us know via a Comment, http://www.oracle.com/technetwork/issue-archive/2010/10-sep/o15asktom-084959.html, https://stewashton.wordpress.com/2015/01/21/stew_compare_sync-introducing-the-package/. Why don't we use the 7805 for car phone chargers? the output of tables, views, and materialized views, Controls of the difference viewer for contents. If two lines are different, trailing whitespaces are not highlighted in the By word mode. This limitation is introduced to avoid an overload (for example, when your SELECT statement returns one million rows). Unfortunately (or fortunately? * EXCEPT SELECT B. To compare databases choose the source and target servers, and databases. To find this action, select two objects in the Database tool window ( View | Tool Windows | Database), right-click the selection and navigate to Tools. Unexpected uint64 behaviour 0xFFFF'FFFF'FFFF'FFFF - 1 = 0? Also, the framework is easily extensible to compare any two tables, across multiple databases. This script helps determine the differences between two database schema files. Actually executing either query takes about 42s plus about 3s to actually transmit the rows. If this is it, than your should change it to number-type field like INTEGER; This query will update price of table_1 with price of table_2, if sort () ==. What is Wario dropping at the end of Super Mario Land 2 and why? Im a total beginner to MySQL and therefore struggling currently in order to find out which query to use for comparing two tables. Is this plug ok to install an AC condensor? If current value in list is greater than the value in table one, use the variable from the last iteration to update field 2. I believe you should investigate BINARY_CHECKSUM, although I would opt for the Red Gate tool: http://msdn.microsoft.com/en-us/library/ms173784.aspx. Arithmetic operations can also be performed on both row and column labels. A Medium publication sharing concepts, ideas and codes. Show Line Numbers: select this check command to show line numbers in the differences viewer. What do you exactly mean with "(beware of more than one match which wont give the result that you expect)" I dont get it fully, http://www.mysqltutorial.org/compare-two-tables-to-find-unmatched-records-mysql.aspx, How a top-ranked engineering school reimagined CS curriculum (Ep. Merge the two tables and add a column that indicates if the item is outdated or not. python - how to compare databases with tables using pandas - Stack Overflow However, if the results do match, you're not guaranteed that the tables are identical because of the [highly unlikely] chance of checksum collisions. The best answers are voted up and rise to the top, Not the answer you're looking for? I would not expect these schema changes to be reflected in the checksum. If commutes with all generators, then Casimir operator? rev2023.4.21.43403. Will this detect differences in the tables' schema (different column names or datatypes)? If it's not too late I would suggest to change your DB structure. How do I concatenate two lists in Python? Objects added in Origin, which will be created in Target in case of a successful migration. Usage. English version of Russian proverb "The hedgehogs got pricked, cried, but continued to eat the cactus". For more information about sorting columns, see Sort data. 565), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. datacompy takes two dataframes as input and gives us a human-readable report containing statistics that lets us know the similarities and dissimilarities between the two dataframes. Also, you can double-click these objects and then compare them from the editor. This framework can be used for upgrade testing or any other scenarios where two tables that share the same DDL needs to be compared. Toad or Navicat). I want to learn how to compare two tables in order to find unmatched records. This is actually extremely fast, each one running against 3 million rows in about 2.5s: If the results of those don't match, you know the tables are different. Run the script below to follow along. Insert results of spBlitzIndex stored procedure into table. DataCompy is fairly useful library if you want to quickly compare two datasets. In PyCharm, you can compare two database objects of the same type. I tested the following code on the dummy data you provided. On the following picture, the first column in the second table is the most different and so it is ignored. . The following screen would be constructed: Heres the full thing with the output included: To build the UIs we will be using the PySimpleGUI library which is based on Tkinter, wxPython and PyQT. After selecting the objects, click on the Compare button.. You can open multiple copies of Schema Diff in individual tabs simultaneously. Click Execute. The duplicate matching is somewhat nave when it comes to picking which rows to match when there are duplicates. density matrix. on April 20, 2023, 5:30 PM EDT. Its too big to load. In PyCharm, you can compare database objects and the output of tables, views, and materialized views. Spend enough time in an analytical or IT function and it will become immediately obvious that working with data is a must. After, that we will execute our query on that table. i.e. To learn more, see our tips on writing great answers. In PyCharm, you can compare database objects and the output of tables, views, and materialized views. First step is - to find all the tables that exists in both the dbs, something like below. Multiple sort fields may be specified. How to Drop Tables using a variable in SQL Server? it says both as "false". please let me know what is wrong with my code or if there is work around. df1_unq_columns() Gives list of columns present in the df1 but not in df2 .In our example date_fld is not present in the df2 hence returned. Learn more about Stack Overflow the company, and our products. But I cannot figure out how to write it down in Python. Python provides tools for working with these files as well. From the below script, you can see that we first need to define our inputs: files: A list of the file path to the two files we want to compare; colsep: A list of the delimiter of each of the two files; data key: A list of the keys of our data set; conn: The connection we will be using for the comparison; it can either be in memory or a physical DB Unless people are technical enough to know how to use Python, R, or the like, they will struggle when they are required to work with larger data sets. When a gnoll vampire assumes its hyena form, do its HP change? Is there a weapon that has the heavy property and the finesse property (or could this be obtained)? Example showed on picture below. Thats the desired output for table 1, the prices should be updated: Could you guys help me out? In such cases, highlighting might introduce additional difficulties during a review. Stupid question: I have to write it like that in python, right? Comparing two PostgreSQL databases with Python - Medium It will also be explicit about where are the dataframes not equal; different sizes, different column names, different values - whatever it is, it'll be explicit about it. Making statements based on opinion; back them up with references or personal experience. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Compare and Find Differences Between Two Tables in SQL The best answers are voted up and rise to the top, Not the answer you're looking for? Database Administrators Stack Exchange is a question and answer site for database professionals who wish to improve their database skills and learn from others in the community. Your home for data science. The tree cost only differs on the last step before returning rows, the concatenation. Highlighting Level: use this menu item to select the highlighting level in the differences viewer. Select OWNER, TABLE_NAME, COLUMN_NAME, DATA_TYPE From ALL_TAB_COLUMNS TABS It only takes a minute to sign up. Vector Projections/Dot Product properties, Counting and finding real solutions of an equation. In this blog then, we will cover a larger number of features available from PySimpleGUI while we also build something that will allow our non-technical friends to quickly compare data. This button displays the currently selected search type. In the Database tool window ( View | Tool Windows | Database), select two tables. Target database uses a MySQL server - source may be DB2. FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. Select the way differences are highlighted. What were the poems other than those by Donne in the Melford Hall manuscript? In my immediately previous article, however, we covered how we can quickly spin UIs in Python and then share them with our wider team or community. Open a browser and show the corresponding help page. Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey. This method can operate in two modes : shallow mode: where only metadata of the files are compared like . Asking for help, clarification, or responding to other answers. A publication dedicated in explaining all things finance, banking and financial technology simply. Compare Two .csv Files in Python Line by Line. Limit yourself only to some columns - do you really need to compare data in all columns? Easily show rows that are different between two tables or queries

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