1. select COUNT(1) from Table
2. select COUNT(*) from Table
3. select * from Table
4.select SUM (row_count)
FROM sys.dm_db_partition_stats
WHERE object_id=OBJECT_ID('table')
AND (index_id=0 or index_id=1);
5.SELECT rows FROM sysindexes WHERE id = OBJECT_ID('Table') AND indid < 2
6. SELECT CAST(p.rows AS float)
FROM sys.tables AS tbl
INNER JOIN sys.indexes AS idx ON idx.object_id = tbl.object_id and idx.index_id < 2
INNER JOIN sys.partitions AS p ON p.object_id=CAST(tbl.object_id AS int)
AND p.index_id=idx.index_id
WHERE ((tbl.name=N'Table'
AND SCHEMA_NAME(tbl.schema_id)='dbo'))