- OVERLAPS
SELECT (DATE '2001-02-16', DATE '2001-12-21') OVERLAPS (DATE '2001-10-30', DATE '2002-10-30');
- 类型转换
REAL '1.23' -- 字串风格 '1.23'::REAL -- PostgreSQL (历史原因)风格
type 'string' 'string'::type CAST ( 'string' AS type )
eg:
SELECT CAST ('1.11' AS REAL)
- 字符串常量
$$Dianne's horse$$ $SomeTag$Dianne's horse$SomeTag$
SELECT 'foo' 'bar'; --等效于 SELECT 'foobar';