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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.
2 mar 2017 · Viewed 283k times. 27. I have multiple IF statements that are independent of each other in my stored procedure. But for some reason they are being nested inside each other as if they are part of one big if statement. ELSE IF(SOMETHNGZ) BEGIN. IF(SOMETHINGY) BEGIN..END. ELSE IF (SOMETHINGY) BEGIN..END. ELSE. BEGIN..END.
WHEN SELECT[comparison_1] THEN [value_1] WHEN [comparison_2] THEN [value_2] ELSE [value_3] END AS [new_column_name] Using if/then logic in SQL with CASE: WITH track_info AS (SELECT t.name, ar.name artist, al.title album_name, FROM track t INNER JOIN album al ON al.album_id = t.album_id INNER JOIN artist ar ON ar.artist_id = al.artist_id) SELECT ...
SELECT * FROM table_name WHERE column1 != ‘expression’ AND column3 LIKE ‘%xzy%’; This query returns every column from table_name, but only those rows where the value in column1 is NOT ‘expression’ AND the value in column3 contains the 'xyz' string. SELECT * FROM table_name WHERE column1 != ‘expression’ OR column3 LIKE ‘%xzy%’;
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.
The first 14 days of this book show you how to use SQL to incorporate the power of modern relational databases into your code. By the end of Week 1, you will be able to use basic SQL commands to retrieve selected data. NOTE: If you are familiar with the basics and history of SQL, we suggest
