Compare structures of two databases?

Question

I wanted to ask whether it is possible to compare the complete database structure of two huge databases. We have two databases, the one is a development database, the other a p

Answer 1

To answer this kind of question currently, I've made a script that uses information_schema content to compare column, datatype, and table

SET @database_current = '';
SET @database_dev = '';
-- column and datatype comparison
SELECT a.TABLE_NAME, a.COLUMN_NAME, a.DATA_TYPE, a.CHARACTER_MAXIMUM_LENGTH,
    b.COLUMN_NAME, b.DATA_TYPE, b.CHARACTER_MAXIMUM_LENGTH
FROM information_schema.COLUMNS a
    LEFT JOIN information_schema.COLUMNS b ON b.COLUMN_NAME = a.COLUMN_NAME
        AND b.TABLE_NAME = a.TABLE_NAME
        AND b.TABLE_SCHEMA = @database_current
WHERE a.TABLE_SCHEMA = @database_dev
    AND (
        b.COLUMN_NAME IS NULL
        OR b.COLUMN_NAME != a.COLUMN_NAME
        OR b.DATA_TYPE != a.DATA_TYPE
        OR b.CHARACTER_MAXIMUM_LENGTH != a.CHARACTER_MAXIMUM_LENGTH
    );
-- table comparison    
SELECT a.TABLE_SCHEMA, a.TABLE_NAME, b.TABLE_NAME
FROM information_schema.TABLES a
    LEFT JOIN information_schema.TABLES b ON b.TABLE_NAME = a.TABLE_NAME
        AND b.TABLE_SCHEMA = @database_current
WHERE a.TABLE_SCHEMA = @database_dev
    AND (
        b.TABLE_NAME IS NULL
        OR b.TABLE_NAME != a.TABLE_NAME
    );

Hope this script can also help people that looks for a non-application solution, but the usage of script. Cheers