動態查找表與主鍵

Question

我需要一個腳本，幫我看看，有主鍵的表，不指定數據庫名稱或表名。需要幫助...

Answer 1

select 
    t.table_schema,t.table_name 
from 
    information_schema.tables t 
    inner join information_schema .columns c 
     on t.table_schema=c.table_schema and t.table_name=c.table_name 
group by 
    t.table_schema,t.table_name 
having 
    sum(if(column_key in ('PRI','UNI'), 1,0)) =1; 

This works。

Answer 2

對於MySQL，總有一個命名爲「主」爲每一個主鍵約束。所以找到它們非常簡單：

SELECT TABLE_SCHEMA, TABLE_NAME 
FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS 
WHERE CONSTRAINT_NAME = 'PRIMARY';