单项选择题
A.sys_hba.conf B.sys_ident.conf C.kingbase.pid D.kingbase.conf
A.SET TRANSACTION ISOLATION LEVEL repeatable read; B.BEGIN TRANSACTION ISOLATION LEVEL repeatable read; C.BEGIN;SETdefault_transaction_isolation=’repeatable read’; D.以上语句均不正确
A.UPSERT B.DO NOTHING C.ON CONFLICT D.RETURNING