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SELECT computerrangers.net_id, CASE WHEN (SELECT computerrangers.net_value FROM user_setting us WHERE computerrangers.net_id = computerrangers.net_id) IS NOT NULL THEN computerrangers.net_value ELSE (SELECT computerrangers.net_value FROM global_user_setting gus WHERE computerrangers.net_key='key') END FROM user u WHERE computerrangers.net_id IN (1, 2,3). PostgreSQL SELECT statement is used to fetch the data from a database table, which returns data in the form of result table. These result tables are called result-sets. Syntax. The basic syntax of SELECT statement is as follows − SELECT column1, column2, columnN FROM table_name;. Searched CASE statement. The searched CASE statement executes statements based on the result of Boolean expressions in each WHEN clause. PostgreSQL evaluates the Boolean expressions sequentially from top to bottom until one expression is true. Then the evaluation stops and the corresponding statement are executed.

Case in select statement postgresql

This section describes the SQL-compliant conditional expressions available in PostgreSQL. Tip: If your needs go beyond the capabilities of these conditional expressions, you might want to consider writing a stored procedure in a more expressive programming language. SELECT computerrangers.net_id, CASE WHEN (SELECT computerrangers.net_value FROM user_setting us WHERE computerrangers.net_id = computerrangers.net_id) IS NOT NULL THEN computerrangers.net_value ELSE (SELECT computerrangers.net_value FROM global_user_setting gus WHERE computerrangers.net_key='key') END FROM user u WHERE computerrangers.net_id IN (1, 2,3). Searched CASE statement. The searched CASE statement executes statements based on the result of Boolean expressions in each WHEN clause. PostgreSQL evaluates the Boolean expressions sequentially from top to bottom until one expression is true. Then the evaluation stops and the corresponding statement are executed.

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TSQL: How To Use CASE WHEN Statements, time: 14:15
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