单项选择题
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
A.11253_init B.11253_vm C.11253_fsm D.11253