數(shù)據(jù)庫(kù)dml和事務(wù)控制語(yǔ)句分別代表什么意思？SQL語(yǔ)言分為四類：數(shù)據(jù)查詢語(yǔ)言DQL、數(shù)據(jù)操作語(yǔ)言DML、數(shù)據(jù)定義語(yǔ)言DDL和數(shù)據(jù)控制語(yǔ)言DCL。還有事務(wù)控制語(yǔ)句TCL:savepoint:savepo

數(shù)據(jù)庫(kù)dml和事務(wù)控制語(yǔ)句分別代表什么意思？

SQL語(yǔ)言分為四類：數(shù)據(jù)查詢語(yǔ)言DQL、數(shù)據(jù)操作語(yǔ)言DML、數(shù)據(jù)定義語(yǔ)言DDL和數(shù)據(jù)控制語(yǔ)言DCL。

還有事務(wù)控制語(yǔ)句TCL:savepoint:savepoint:rollback:fallback to a point commit:commit a transaction

SQL語(yǔ)言提供兩種數(shù)據(jù)控制（自主訪問控制）語(yǔ)句：

①grant（authorization）語(yǔ)句，如grant select、insert on student to Zhang Yong、mth crank對(duì)

②撤銷（召回）聲明，如撤銷學(xué)生表上的INSFRT張勇；

sql語(yǔ)言中提供了哪些數(shù)據(jù)控制的語(yǔ)句？

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