环境：mssql ent 2k8 r2
原理：遍历所有含自增列的用户表，用sp_spaceused过程分别获取每张表的行数并写入临时表，然后使用IDENT_CURRENT函数获取表的最大标识值，比较二者并返回结果
IF OBJECT_ID('tempdb..#TableRowCount','U') IS NOT NULL DROP TABLE #TableRowCount
GO
CREATE TABLE #TableRowCount (Name sysname PRIMARY KEY, RowCnt DECIMAL(11,0), Reserved VARCHAR(18), Data VARCHAR(18), Index_Size VARCHAR(18), Unused VARCHAR(18))
GO
DECLARE curCntAllTableRows CURSOR LOCAL FAST_FORWARD FOR
SELECT name FROM sys.tables WHERE OBJECTPROPERTY(object_id,'TableHasIdentity')=1
OPEN curCntAllTableRows
DECLARE @TableName sysname
FETCH NEXT FROM curCntAllTableRows INTO @TableName
WHILE @@FETCH_STATUS=0
BEGIN
INSERT INTO #TableRowCount EXEC sys.sp_spaceused @TableName
FETCH NEXT FROM curCntAllTableRows INTO @TableName
END
CLOSE curCntAllTableRows
DEALLOCATE curCntAllTableRows
/*由于IDENT_CURRENT对于空表也会返回1，所以做特别处理*/
WITH cteA AS (
SELECT Name,RowCnt,CASE IDENT_CURRENT(Name) WHEN 1 THEN RowCnt ELSE IDENT_CURRENT(Name) END AS 'CurrID'
FROM #TableRowCount
)
SELECT Name,RowCnt,CurrID
FROM cteA
WHERE RowCnt<>CurrID文毕。