查看Mysql表名、主鍵、列名

Mysql有幾個內部表，存放schema，表名，主鍵，索引，列名等信息。

此次做數倉遷移，爲了配置datax通用腳本，用到這些，順手整理一下:

select t.table_schema,t.table_name,concat('vnm_db01_',t.table_name) targettable,k.column_name,group_concat(c.column_name) as col 
from information_schema.tables t
join information_schema.columns c 
on c.table_schema=t.table_schema and c.table_name=t.table_name
left join (select table_schema,table_name,column_name from information_schema.key_column_usage where constraint_name='primary') k
on c.table_schema=k.table_schema and c.table_name=k.table_name
where t.table_schema='metis_prod'
and t.table_name in ('account_acl','account_item')
group by c.table_name
order by c.table_name
;

解釋：查詢schema，表名，拼接目標表名，主鍵，字段名(已列轉行)
information_schema.tables:存放表名的
information_schema.columns:存放表字段的
information_schema.key_column_usage:存放表主鍵、索引之類的