描述MYSQL中所有表的主键

Question

I want to get the result of Desc for only specific columns of each table in the information schema, let's say Primary Key.

Can this be done?

I tried things like

 SELECT * FROM (DESC TABLENAME) WHERE ....;

but it did not work.

Also I want this to work for all tables.

Answer 1

DESC aka DESCRIBE aka SHOW COLUMNS will not work in a subquery. But SELECT will. You can for example replace

SHOW COLUMNS FROM t IN test LIKE '%2';

with

SELECT column_name AS `Field`, column_type AS `Type`,
is_nullable AS `Null`,
column_key as 'Key',
column_default AS `Default`, extra AS `Extra`
FROM information_schema.columns
WHERE table_schema = 'test'
AND table_name = 't'
AND column_name like '%2';

and you'll get the same thing.