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  • sql 查询所有数据库、表名、表字段总结

    ms sql server
    1、查询所有表
    select [id], [name] from [sysobjects] where [type] = 'u' order by [name]
    2、查询所有数据库
    3、select [name] from [sysdatabases] order by [name]
    查询表中字段 
    select [name] from [syscolumns] where [name] = 'tableXXX'order by [colid]

    oracle

    1、查找表的所有索引(包括索引名,类型,构成列):

    select t.*,i.index_type from user_ind_columns t,user_indexes i where t.index_name = i.index_name and t.table_name = i.table_name and t.table_name = 要查询的表

    2、查找表的主键(包括名称,构成列):

    select cu.* from user_cons_columns cu, user_constraints au where cu.constraint_name = au.constraint_name and au.constraint_type = 'P' and au.table_name = 要查询的表

    3、查找表的唯一性约束(包括名称,构成列):

    select column_name from user_cons_columns cu, user_constraints au where cu.constraint_name = au.constraint_name and au.constraint_type = 'U' and au.table_name = 要查询的表

    4、查找表的外键(包括名称,引用表的表名和对应的键名,下面是分成多步查询):

    select * from user_constraints c where c.constraint_type = 'R' and c.table_name = 要查询的表

    查询外键约束的列名:

    select * from user_cons_columns cl where cl.constraint_name = 外键名称

    查询引用表的键的列名:

    select * from user_cons_columns cl where cl.constraint_name = 外键引用表的键名

    5、查询表的所有列及其属性

    select t.*,c.COMMENTS from user_tab_columns t,user_col_comments c where t.table_name = c.table_name and t.column_name = c.column_name and t.table_name = 要查询的表

    6、查询所有表
    select* from tabs

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  • 原文地址:https://www.cnblogs.com/wangguowen27/p/2683165.html
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