MySQL之-查询指定的数据库和表是否存在

1、查看指定的数据库是否存在

SELECT information_s
chema.SCHEMATA.SCHEMA_NAME FROM information_schema.SCHEMATA where SCHEMA_NAME='databaseName';

2、查看指定的数据库下是否存在某张表

SELECT DISTINCT t.table_name, n.SCHEMA_NAME FROM information_schema.TABLES t, information_schema.SCHEMATA n WHERE t.

table_name = 'tableName' AND n.SCHEMA_NAME = 'databaseName';