查询数据库指定表是否存在

MYSQL：

select count(*) as tabcount from INFORMATION_SCHEMA.TABLES where TABLE_SCHEMA='dbname()' and TABLE_NAME='tablename‘

MSSQL：

select count(*) as tabcount from tempdb.dbo.sysobjects where id = object_id(N'tablename') and type='U'

ORACLE：

select count(*) as tabcount from dba_tables where table_name='tablename'

DB2：

select count(*) as tabcount from syscat.tables where tabname = upper('tablename')

SYBASE：

select count(*) as tabcount from sysobjects where name='tablename' and type='U'

DM：

select count(*) as tabcount from sysobjects where name='tablename' and type='U'