How to find all the relations between all mysql tables?

mysql database relationship relation
user3148861 picture user3148861 · Dec 31, 2013 · Viewed 73.4k times · Source

How to find all the relations between all MySQL tables? If for example, I want to know the relation of tables in a database of having around 100 tables.

Is there anyway to know this?

Answer

xudre picture xudre · Nov 17, 2014

The better way, programmatically speaking, is gathering data from INFORMATION_SCHEMA.KEY_COLUMN_USAGE table as follows:

SELECT 
  `TABLE_SCHEMA`,                          -- Foreign key schema
  `TABLE_NAME`,                            -- Foreign key table
  `COLUMN_NAME`,                           -- Foreign key column
  `REFERENCED_TABLE_SCHEMA`,               -- Origin key schema
  `REFERENCED_TABLE_NAME`,                 -- Origin key table
  `REFERENCED_COLUMN_NAME`                 -- Origin key column
FROM
  `INFORMATION_SCHEMA`.`KEY_COLUMN_USAGE`  -- Will fail if user don't have privilege
WHERE
  `TABLE_SCHEMA` = SCHEMA()                -- Detect current schema in USE 
  AND `REFERENCED_TABLE_NAME` IS NOT NULL; -- Only tables with foreign keys

There are more columns info like ORDINAL_POSITION that could be useful depending your purpose.

More info: http://dev.mysql.com/doc/refman/5.1/en/key-column-usage-table.html

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