MySQL中查詢所有數(shù)據(jù)庫名和表名
showdatabases;
select table_name from information_schema.tables where table_schema='database_name' and table_type='base table';
select column_name from information_schema.columns where table_schema='database_name' and table_name='table_name';
select column_name,data_type from information_schema.columns where table_schema='database_name' and table_name='table_name';
SQLServer中查詢所有數(shù)據(jù)庫名和表名
select * from sysdatabases;
select * from sysobjects where xtype='U';
xtype='U':表示所有用戶表磷仰，xtype='S':表示所有系統(tǒng)表拭卿。
select name from syscolumns whereid=Object_Id('table_name');
selects c.name,st.name from syscolumns sc,systypes st where sc.xtype=st.xtypeandsc.id in(select id from sysobjects where xtype='U'andname='table_name');
由于Oralce沒有庫名,只有表空間,所以O(shè)racle沒有提供數(shù)據(jù)庫名稱查詢支持，只提供了表空間名稱查詢恬惯。
select * from v$tablespace;--查詢表空間(需要一定權(quán)限)
select * from user_tables;
select column_name from user_tab_columns where table_name ='table_name';
selectcolumn_name, data_typefromuser_tab_columnswheretable_name ='table_name';
