graphql-engine/server/src-rsr/mysql_table_metadata.sql

-- This could also be done with making MySQL itself return a non-redundant structure
-- in JSON to simplify the processing within the engine.
SELECT c.TABLE_SCHEMA, c.TABLE_NAME, c.COLUMN_NAME, c.ORDINAL_POSITION, c.COLUMN_DEFAULT,
         c.IS_NULLABLE, c.DATA_TYPE, c.COLUMN_TYPE, c.COLUMN_KEY, c.COLUMN_COMMENT,
       k.CONSTRAINT_NAME, k.ORDINAL_POSITION, k.POSITION_IN_UNIQUE_CONSTRAINT,
         k.REFERENCED_TABLE_SCHEMA, k.REFERENCED_TABLE_NAME, k.REFERENCED_COLUMN_NAME
  FROM INFORMATION_SCHEMA.COLUMNS c
       LEFT OUTER JOIN
       INFORMATION_SCHEMA.KEY_COLUMN_USAGE k
       ON c.TABLE_NAME = k.TABLE_NAME AND
          c.TABLE_SCHEMA = k.TABLE_SCHEMA AND
          c.COLUMN_NAME = k.COLUMN_NAME
 WHERE c.TABLE_SCHEMA = ?
 ORDER BY c.TABLE_NAME ASC, c.ORDINAL_POSITION ASC
;