DROP CAST
臺濘
DROP CAST [ IF EXISTS ] (sourcetype AS targettype) [ CASCADE | RESTRICT ]
柟誄
DROP CAST 役鍴婔婻噽嬉垔幬誺䔇䌂傋蘸扵㔗
襕脘役鍴婔婻䌂傋蘸扵嘹媙釂拖橬溊潡蔙䕞䔇昄扞䌂傋㔗認滇启录傺婔婻䌂傋蘸扵䕩劯䔇溄鍊㔗
埗昄
- IF EXISTS
套悩毺垔䔇蘸扵婉庻婘闼幽埏庺婔婻 notice 蔯婉滇檕庺婔婻髍臇㔗
- sourcetype
䌂傋蘸扵麯䔇溊昄扞䌂傋
- targettype
䌂傋蘸扵麯䔇䕞湺昄扞䌂傋
- CASCADE
RESTRICT
認底髞庖澇橬傂嘘昽悩啹婺婘䌂傋蘸扵婪澇橬冺蕡噿係㔗
冋床
役鍴傯 text 彄 int 䔇蘸扵
DROP CAST (text AS int);