In MySQL, I have two different databases -- let's call them A and B.
在MySQL中，我有两个不同的数据库——我们称它们为A和B。
Is it possible to perform a join between a table that is in database A, to a table that is in database B?
是否可以在数据库a中的表和数据库B中的表之间执行联接?
3 个解决方案
#1
112
Yes, assuming the account has appropriate permissions you can use:
是的，假设该帐户具有适当的权限，您可以使用:
SELECT <...>
FROM A.table1 t1 JOIN B.table2 t2 ON t2.column2 = t1.column1;
You just need to prefix the table reference with the name of the database it resides in.
您只需要在表引用前面加上它所驻留的数据库的名称。
#2
5
SELECT <...>
FROM A.tableA JOIN B.tableB
#3
1
SELECT *
FROM A.tableA JOIN B.tableB
or
或
SELECT *
FROM A.tableA JOIN B.tableB
ON A.tableA.id = B.tableB.a_id;
#1
112
Yes, assuming the account has appropriate permissions you can use:
是的，假设该帐户具有适当的权限，您可以使用:
SELECT <...>
FROM A.table1 t1 JOIN B.table2 t2 ON t2.column2 = t1.column1;
You just need to prefix the table reference with the name of the database it resides in.
您只需要在表引用前面加上它所驻留的数据库的名称。
#2
5
SELECT <...>
FROM A.tableA JOIN B.tableB
#3
1
SELECT *
FROM A.tableA JOIN B.tableB
or
或
SELECT *
FROM A.tableA JOIN B.tableB
ON A.tableA.id = B.tableB.a_id;