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15 wrz 2008 · Once you figure out how it works, you can convert three results to two results by deciding the behavior of null. E.g. this would treat null as not saleable: SELECT CASE WHEN obsolete = 'N' OR instock = 'Y' THEN 'true' ELSE 'false' -- either false or null END AS saleable. Share.
28 maj 2024 · In this article, we explored different options for executing IF-THEN logic in a SQL SELECT statement. These options include using CASE , IIF() , and CHOOSE() . Furthermore, if we want a query that’s used in almost every dialect, we must choose the CASE statement.
SQL Cheat Sheet: Fundamentals. Performing calculations with SQL. Performing a single calculation: SELECT 1320+17; Performing multiple calculations: SELECT 1320+17, 1340-3, 7*191, 8022/6; Performing calculations with multiple numbers: SELECT 1*2*3, 1+2+3; Renaming results: SELECT 2*3 AS mult, 1+2+3 AS nice_sum; Selecting tables, columns, and rows:
This edition of SQL Practice Problems assumes that you have some basic background knowledge about relational databases and tables. However, I’ve added some beginner level questions to gradually introduce the various parts of the SQL Select statement for those with less experience in SQL.
SELECT * FROM table_name WHERE column1 != ‘expression’ OR column3 LIKE ‘%xzy%’; This query returns every column from table_name, but only those rows where the value in column1 is NOT ‘expression’ OR the value in column3 contains the 'xyz' string.
I need help writing logic that looks at column B and returns the value in column A that is 2 months prior. Say for instance Column B is March, I'd like to return the value for January. I'm guessing I could use some sort of CASE logic to do so? CASE WHEN ColB = 'March' THEN (Select ColA where ColB = 'January')
25 wrz 2020 · Download this 2-page SQL Basics Cheat Sheet in PDF or PNG format, print it out, and stick to your desk. The SQL Basics Cheat Sheet provides you with the syntax of all basics clauses, shows you how to write different conditions, and has examples.
