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1、重置 Identity 字段的起始值
DBCC CHECKIDENT ( '[table-name]', RESEED, 0 )
2、压缩数据库 (清除 transaction log)
DUMP TRANSACTION [database-name] WITH NO_LOG
3、动态 top xxx
Set ROWCOUNT = xxx 错的
set rowcount 0 select时显示所有记录
set rowcount 1 select时显示一条记录，但可以指定top xx显示多条记录
4、动态 order by 注意动态排序字段需要类型相同，如都是数值或字符，或者可以相互转换
select ...from ... where
order by
case when @ord=1 then name end,
case when @ord=-1 then name end desc
或者
ORDER BY
CASE @OrderBy
WHEN 'CompanyName' THEN CompanyName
WHEN 'ContactName' THEN ContactName
END
5、创建、调用 COM 对象 (RegEx)
http://sqlteam.com/item.asp?ItemID=13947
6、用 temp table 而不用 cursor
select into #t
while exist(select ... from #t where xxx)
begin
....
delete from #t where xxx
end
2005-9-23 11:08:12
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