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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.
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.
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.
20 paź 2017 · SELECT (case when [A.column1='1'] then (select value from B where B.clientId=100 and A.column1=B.Id) when [A.column1='2'] then (select value from C where C.clientId=100 and A.column1=C.Id) when [A.column1='3'] then (select value from D where D.clientId=100 and A.column1=D.Id) ... and so on uptil 30 more 'when' conditions ...
3 wrz 2024 · Syntax. IF boolean_expression { sql_statement | statement_block } [ ELSE { sql_statement | statement_block } ] Arguments. boolean_expression. An expression that returns TRUE or FALSE. If the Boolean expression contains a SELECT statement, the SELECT statement must be enclosed in parentheses. { sql_statement | statement_block }
20 sie 2024 · In this article, we’ll explore how to use the CASE statement with multiple conditions, providing simple examples that should work across most major relational database management systems (RDBMS s).
2 cze 2023 · SQL CASE Statement Syntax. The syntax of the SQL CASE expression is: CASE [expression] WHEN condition_1 THEN result_1 WHEN condition_2 THEN result_2 ... WHEN condition_n THEN result_n ELSE result END case_name. The CASE statement can be written in a few ways, so let’s take a look at these parameters.
