- 統(tǒng)計(jì)2個(gè)時(shí)間差：SELECT datediff( '2019/11/19 00:00','2019/11/23 00:00' );
2.定義時(shí)間變量：
SET @dtnow = now( ); #當(dāng)前時(shí)間
SET @dt1 = ( CAST( SYSDATE( ) AS DATE ) - INTERVAL 30 DAY );#30天前
SET @dt2 = ( CAST( SYSDATE( ) AS DATE ) - INTERVAL 0 DAY );#截止今天
SET @daynum = DATEDIFF( @dt2, @dt1 );#2時(shí)間差的天數(shù)
UNIX_TIMESTAMP( @dt1 )瞧栗；# 取時(shí)間戳
select UNIX_TIMESTAMP( now( ) ); #將格式化時(shí)間轉(zhuǎn)為時(shí)間戳
select FROM_UNIXTIME(unix_timestamp(now()),'%Y-%m-%d %H:%i:%s');將時(shí)間戳轉(zhuǎn)為格式化時(shí)間
