这些文字都具有类型'unknown'，让ELSE来确定CASE的返回类型。但是文字不能被解释为那种类型。
这些文字都具有类型'unknown'，让ELSE来确定CASE的返回类型。但是文字不能被解释为那种类型。
General PostgreSQL CASE expression The following illustrates the general form of the CASE statement: CASE WHEN condition_1 THEN result_1 WHEN condition_2 THEN result_2 [WHEN ...] [ELSE else_result] END In this syntax, each condition (condition_1, condition_2…) is a boolean expression that...
PostgreSQL supports CASE expression which is the same as if/else statements of other programming languages. The CASE expression can be used with SELECT, WHERE, GROUP BY, and HAVING clauses. Syntax Copy CASE WHEN <condition1> THEN <result1> WHEN <condition2> THEN <result2> …. [ELSE <else...
you’ll get a syntax error: ERROR: relation “person” does not exist LINE 1: SELECT FullName FROM Person This is because PostgreSQL is converting “Person” to “person”, but there is no table called “person”. It is actually called “Person”. ...
虽然SQLCASE可以嵌入到PL/pgSQL代码中的SQL表达式中（大多数情况下只是SQL命令的粘合剂），但不能有独立...
The solution is not for PostgreSQL to implement random syntax introduced by database systems that don't care about the standard, it is the other way around. Reply Mahfoud Bouabdallah says: January 28, 2023 at 3:18 pm Thanks for the great article. Can I apply case insensitive in my ...
虽然SQLCASE可以嵌入到PL/pgSQL代码中的SQL表达式中（大多数情况下只是SQL命令的粘合剂），但不能有独立...
@valeriyoThis is the expected behavior based on PostgreSQL'scase insensitive identifier syntaxand following PostgreSQL's own logic of folding unquoted identifiers to lower case. Even if the generated SQL didn't show what was going to happen and the following plain SQL was sent to the database ...
PostgreSQL Case – When – ThenCaseSyntax and examples of conditional Case – When – Then – Else.CREATE OR REPLACE FUNCTION get_case(in p_name varchar(2)) RETURNS varchar AS $$ DECLARE v_name varchar(50); BEGIN CASE WHEN p_name = 'T' then v_name:='The name is TEST'; return v...