I'm trying to create a little SQL script (in SQL Server Management Studio) to get a list of all tables in two different databases. The goal is to find out which tables exist in both databases and which ones only exist in one of them.
I have found various scripts on SO to list all the tables of one database, but so far I wasn't able to get a list of tables of multiple databases.
So: is there a way to query SQL Server for all tables in a specific database, e.g. SELECT * FROM ... WHERE databaseName='first_db'
so that I can join this with the result for another database?
The easiest way to find all tables in SQL is to query the INFORMATION_SCHEMA views. You do this by specifying the information schema, then the “tables” view. Here's an example. SELECT table_name, table_schema, table_type FROM information_schema.
SQL Server allows you to join tables from different databases as long as those databases are on the same server. The join syntax is the same; the only difference is that you must fully qualify table names.
As far as I know, you can only query tables for the active database. But you could store them in a temporary table, and join the result:
use db1
insert #TableList select (...) from sys.tables
use db2
insert #TableList2 select (...) from sys.tables
select * from #TableList tl1 join Tablelist2 tl2 on ...
SELECT * FROM database1.INFORMATION_SCHEMA.TABLES
UNION ALL
SELECT * FROM database2.INFORMATION_SCHEMA.TABLES
UPDATE
In order to compare the two lists, you can use FULL OUTER JOIN
, which will show you the tables that are present in both databases as well as those that are only present in one of them:
SELECT *
FROM database1.INFORMATION_SCHEMA.TABLES db1
FULL JOIN database2.INFORMATION_SCHEMA.TABLES db2
ON db1.TABLE_NAME = db2.TABLE_NAME
ORDER BY COALESCE(db1.TABLE_NAME, db2.TABLE_NAME)
You can also add WHERE db1.TABLE_NAME IS NULL OR db2.TABLE_NAME IS NULL
to see only the differences between the databases.
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