2014年5月25日 星期日

Oracle SQL 的分類DML、DCL、DDL

Oracle SQL 的分類DML、DCL、DDL

使用工具sqldeveloper
  請先參考 sqldeveloper下載及安裝及連線

測試資料來源請先參考 Oracle DB 目錄


DDL 資料定義語言   Data Definition Language (DDL)

相關指令:

CREATE - to create objects in the database
ALTER - alters the structure of the database
DROP - delete objects from the database
TRUNCATE - remove all records from a table, including all spaces allocated for the records are removed
COMMENT - add comments to the data dictionary
RENAME - rename an object


DML 資料操作語言    Data Manipulation Language (DML)

相關指令:

SELECT - retrieve data from the a database
INSERT - insert data into a table
UPDATE - updates existing data within a table
DELETE - deletes all records from a table, the space for the records remain
MERGE - UPSERT operation (insert or update)
CALL - call a PL/SQL or Java subprogram
EXPLAIN PLAN - explain access path to data
LOCK TABLE - control concurrency

DCL 資料控制語言    Data Control Language (DCL)

相關指令:

GRANT - gives user's access privileges to database
REVOKE - withdraw access privileges given with the GRANT command


TCL 交易控制語言   Transaction Control (TCL)

相關指令:

COMMIT - save work done
SAVEPOINT - identify a point in a transaction to which you can later roll back
ROLLBACK - restore database to original since the last COMMIT
SET TRANSACTION - Change transaction options like isolation level and what rollback segment to use

參考:http://www.xpode.com/ShowArticle.aspx?Articleid=156











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