? ? ? ? ? ? ? ? ? ? ? ? ? ? 列出給定表的基本信息

需求描述

需求：查詢出給定的表dept,emp,bonus,salgrade里的表名，字段名、字段類型、字段注釋、表注釋信息。

解決方法:通過各個數據庫里提供的與數據庫相關的數據字典進行查詢。

注: 數據庫數據集SQL腳本詳見如下鏈接地址

員工表結構和數據初始化SQL腳本

SQL代碼

-- Oracle: SELECT B.TABLE_NAME,B.COLUMN_NAME,B.DATA_TYPE,A.COMMENTS AS Table_Comm ,C.COMMENTS AS Column_Comm from user_tab_comments A JOIN user_tab_columns BON A.TABLE_NAME = B.TABLE_NAME JOIN user_col_comments C ON B.TABLE_NAME = C.TABLE_NAME AND B.COLUMN_NAME = C.COLUMN_NAME WHERE A.TABLE_NAME IN('DEPT','EMP','BONUS','SALGRADE')-- Mysql: SELECT A.TABLE_NAME,A.COLUMN_NAME,A.DATA_TYPE,B.TABLE_COMMENT AS Table_Comm,A.COLUMN_COMMENT AS Column_Comm FROM INFORMATION_SCHEMA.COLUMNS A JOIN INFORMATION_SCHEMA.TABLES BON A.TABLE_NAME = B.TABLE_NAME WHERE A.TABLE_SCHEMA='SHENL' AND A.TABLE_NAME IN('DEPT','EMP','BONUS','SALGRADE')-- Sql Server:USE Shenl; GO SELECTA.name AS table_name,B.name AS column_name,C.name AS data_type,D.value AS column_comm FROM sys.tables A INNER JOIN ( SELECT B.object_id,NULL AS name ,NULL AS user_type_id,0 as column_id FROM sys.tables A INNER JOIN sys.columns B ON B.object_id = A.object_id WHERE A.name IN ('dept','emp','bonus','salgrade') AND column_id = 1UNION SELECT object_id,name,user_type_id,column_id FROM sys.columns )B ON B.object_id = A.object_id LEFT JOIN sys.systypes C ON B.user_type_id = C.xtype INNER JOIN sys.extended_properties D ON D.major_id = B.object_id AND D.minor_id = B.column_id WHERE A.name IN ('dept','emp','bonus','salgrade') ORDER BY A.name-- 或： USE Shenl; GO SELECT table_name,column_name,data_type,column_comm,F.value as table_comm FROM ( SELECT A.object_id AS Object_id, A.name AS table_name,B.name AS column_name,C.name AS data_type,D.value AS column_comm FROM sys.tables A INNER JOIN sys.columns B ON B.object_id = A.object_id LEFT JOIN sys.systypes C ON B.user_type_id = C.xtype INNER JOIN sys.extended_properties D ON D.major_id = B.object_id AND D.minor_id = B.column_id WHERE A.name IN ('dept','emp','bonus','salgrade') )E JOIN ( SELECT major_id,value FROM sys.extended_properties A JOIN sys.tables B ON A.major_id = B.object_id AND B.name IN ('dept','emp','bonus','salgrade') AND A.minor_id = 0 )F ON E.object_id = F.major_id

執行結果

總結

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