常用数据库查询判断表和字段是否存在的SQL
常用数据库查询判断表和字段是否存在的SQL(如果结果为1表示存在,为0表示不存在)
1、MSSQL Server 表: SELECT COUNT(*) FROM dbo.sysobjects WHERE name= ‘table_name‘; 字段: SELECT COUNT(*) FROM syscolumns WHERE id=object_id(‘table_name’) AND name= ‘column_name‘; 2、My SQL 表: SELECT COUNT(*) FROM information_schema.tables WHERE table_name =‘table_name‘; 字段: SELECT COUNT(*) FROM information_schema.columns WHERE table_name =‘table_name‘ AND column_name =‘column_name‘; 3、Oracle 表: SELECT count(*) FROM USER_OBJECTS WHERE OBJECT_NAME = ‘table_name‘; 字段: SELECT COUNT(*) FROM USER_TAB_COLUMNS WHERE TABLE_NAME =‘table_name‘ AND column_name =‘column_name‘; 4、PostgreSql 表: SELECT count(*) FROM information_schema.tables WHERE table_schema=‘table_schema‘ AND table_name =‘table_name‘; 字段: SELECT count(*) FROM information_schema.columns WHERE table_schema=‘table_schema‘ AND table_name =‘table_name‘ AND column_name=‘column_name‘;
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