摘要：
函数调用， 这个简单 CREATE FUNCTION concat_lower_or_upper(a text, b text, uppercase boolean DEFAULT false) RETURNS text AS $$ SELECT CASE WHEN $3 THEN UPPER($1 || ' ' || $2) ELSE LOWER($1 || '... 阅读全文
摘要：
A value expression is one of the following: A constant or literal value A column reference A positional parameter reference, in the body of a function definition or prepared statement A subscripted ex... 阅读全文
摘要：
4.1. Lexical Structure （SQL命令的结构or组成） A token can be akey word, anidentifier, aquoted identifier, aliteral(or constant), or a special character symbol. SQL语句的基本组成 关键字：SELECT, INSERT, UP... 阅读全文