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A.2
B.4
C.8
D.16

A.READ UNCOMMITTED
B.READ COMMITTED
C.REPEATABLE READ
D.SERIALIZABLE

A.默認(rèn)值約束通過(guò)關(guān)鍵字DEFAULT進(jìn)行設(shè)置
B.默認(rèn)值約束可以在創(chuàng)建表時(shí)設(shè)置
C.默認(rèn)值約束可以在修改數(shù)據(jù)表時(shí)設(shè)置
D.通過(guò)ALTER TABLE語(yǔ)句的DROP子句刪除默認(rèn)值約束

A.查詢數(shù)據(jù)的SQL語(yǔ)句中多個(gè)字段名使用分號(hào)分隔
B.查詢數(shù)據(jù)的SQL語(yǔ)句必須包含數(shù)據(jù)表的所有字段
C.通配符“?”表示查詢數(shù)據(jù)表的所有字段名
D.通配符“#”表示查詢數(shù)據(jù)表的所有字段名

A.READ UNCOMMITTED
B.READ COMMITTED
C.REPEATABLE READ
D.SERIALIZABLE

A.WHERE
B.GROUP BY
C.LIMIT
D.TRUNCATE

A.BEGIN TRANSACTION
B.START TRANSACTION
C.END TRANSACTION
D.STOP TRANSACTION

A.DROP
B.ALTER
C.DELETE
D.INDEX

A.PASSWORD EXPIRE
B.PASSWORD EXPIRE DEFAULT
C.PASSWORD EXPIRE NEVER
D.PASSWORD EXPIRE INTERVAL 10DAY

A.READ UNCOMMITTED
B.READ COMMITTED
C.REPEATABLE READ
D.SERIALIZABLE