Can you DROP TABLE IF EXISTS by specifying database name with table?

问题

I am trying to drop a table in a database with the following query statement:

mysql_query('DROP TABLE IF EXISTS "dbName.tableName"') or die(mysql_error());

But I keep getting an error. Does anyone know if specifying the dbName.tableName is invalid?

回答1:

mysql_query('DROP TABLE IF EXISTS `dbName`.`tableName`') or die(mysql_error());

回答2:

You should use backticks instead of double quotes like this:

mysql_query('DROP TABLE IF EXISTS `dbName`.`tableName`');

回答3:

You can't use double quotes to quote db/table names, instead you either leave them unquoted or use backticks. But to answer your question, yes it is perfectly valid to specify the database name.

DROP TABLE `dbName`.`tableName`

来源：https://stackoverflow.com/questions/6046474/can-you-drop-table-if-exists-by-specifying-database-name-with-table