これを試してください - テーブル名と行数が表示されます:
SELECT t.NAME AS TableName, SUM(p.rows) AS [RowCount] FROM sys.tables t INNER JOIN sys.indexes i ON t.OBJECT_ID = i.object_id INNER JOIN sys.partitions p ON i.object_id = p.OBJECT_ID AND i.index_id = p.index_id WHERE i.index_id <= 1 GROUP BY t.NAME, i.object_id, i.index_id, i.name ORDER BY SUM(p.rows) DESC
プレ>すべてのテーブルとその行数が 1 つの出力に表示されます。