[Personal notes hive] mysql obtains table metadata information primary key, primary key type, etc.

Mysql obtains the table metadata information primary key, primary key type, etc.:
we can directly obtain the relevant information we need according to the table name: for example, as follows

SELECT k.TABLE_NAME,k.COLUMN_NAME
FROM 
  information_schema.table_constraints t
JOIN 
  information_schema.key_column_usage k
USING 
    (constraint_name,table_schema,table_name)
WHERE 
    t.constraint_type='PRIMARY KEY'
AND 
    t.table_schema='crm'	# 数据库名字
AND 
  t.table_name='t_customer' # 表名

The details can be changed according to the above requirements