mysql 查看所有没有主键的表

SELECT
    #CONCAT("truncate table ",table_name,";")
table_name
FROM
    information_schema. TABLES
WHERE
    table_schema = 'test'
AND TABLE_NAME NOT IN (
    SELECT
        table_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 = 'test'
)

将test改成自己mysql的数据库名，即可查出结果。这个sql的结果会包含view。

下面这个sql只会返回table。

USE INFORMATION_SCHEMA;

SELECT

    TABLES.table_schema,TABLES.table_name

FROM TABLES

LEFT JOIN KEY_COLUMN_USAGE AS c

ON (

       TABLES.TABLE_NAME = c.TABLE_NAME

   AND c.CONSTRAINT_SCHEMA = TABLES.TABLE_SCHEMA

   AND c.constraint_name = 'PRIMARY'

)

WHERE

    tables.table_type <>"VIEW" and TABLES.table_schema in ('test1','test2','test3')

AND c.constraint_name IS NULL;