mysql查詢某張表是否存在某個欄位
阿新 • • 發佈:2019-02-09
Mysql
1、判斷一個表是否存在
語法:
SELECT table_name FROM information_schema.TABLES WHERE table_name ='表名';
sql例子:
SELECT table_name FROM information_schema.TABLES WHERE table_name ='t_iov_vehicle_owner_info'
存在:
不存在:
備註,sql也可以這樣寫:
select count(*) from information_schema.tables where table_name='t_iov_vehicle_owner_info'
2、判斷表中一個欄位是否存在
語法:
select count(*) from information_schema.columns where table_name = '表名' and column_name = '欄位名'
sql例子:
select count(*) from information_schema.columns where table_name = 't_iov_vehicle_owner_info' and column_name = 'id'