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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.
23 lis 2012 · Here, using CASE Statement and find result: select (case when condition1 then result1. when condition2 then result2. else result3. end) as columnname from tablenmae: For example: select (CASE WHEN IDParent< 1 then ID. else IDParent END) as columnname. from tablenmae.
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:
20 kwi 2016 · SQL: Practice Exercises for SELECT Statement. If you want to test your skills using the SQL SELECT statement, try some of our practice exercises. These practice exercises allow you to test your skills with the SELECT statement. You will be given questions that you need to solve.
9 lis 2023 · Exercise 1: List All Students. Exercise 2: List All Student Names. Exercise 3: Select a Specific Lecturer by ID. Exercise 4: Select Students by Last Name. Exercise 5: Select Students Whose Last Name Starts with D. Exercise 6: Use Multiple Conditions to Select an Academic Semester. Exercise 7: Sort Students by Last Name.
30 paź 2023 · The SQL IF statement in SELECT queries is utilized to introduce conditional logic, allowing for more dynamic and flexible data retrieval. Essentially, it lets you specify conditions to dictate which data should be fetched or how it should be displayed.
