MYSQL判断某个表是否已经存在

方法一、
You don't need to count anything.

SELECT 1 FROM testtable LIMIT 1;
If there's no error, table exists.

方法二、
Or, if you want to be correct, use INFORMATION_SCHEMA.

SELECT * 
FROM information_schema.tables
WHERE table_schema = 'yourdb' 
    AND table_name = 'testtable'
LIMIT 1;

方法三、
Alternatively, you can use SHOW TABLES

SHOW TABLES LIKE 'yourtable';
If there is a row in the resultset, table exists.

个人觉得方法三很不错

FROM: http://stackoverflow.com/questions/8829102/mysql-check-if-table-exists-without-using-select-from#8829109