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SELECT TOP 100 PERCENT --a.id,
      CASE WHEN a.colorder = 1 THEN d.name ELSE '' END AS ±íÃû,
      CASE WHEN a.colorder = 1 THEN isnull(f.value, '') ELSE '' END AS ±í˵Ã÷,
      a.colorder AS ×Ö¶ÎÐòºÅ, a.name AS ×Ö¶ÎÃû, CASE WHEN COLUMNPROPERTY(a.id,
      a.name, 'IsIdentity') = 1 THEN '√' ELSE '' END AS ±êʶ,
      CASE WHEN EXISTS
          (SELECT 1
         from dbo.sysindexes si INNER JOIN
               dbo.sysindexkeys sik ON si.id = sik.id AND si.indid = sik.indid INNER JOIN
               dbo.syscolumns sc ON sc.id = sik.id AND sc.colid = sik.colid INNER JOIN
               dbo.sysobjects so ON so.name = si.name AND so.xtype = 'PK'
         WHERE sc.id = a.id AND sc.colid = a.colid) THEN '√' ELSE '' END AS Ö÷¼ü,
      b.name AS ÀàÐÍ, a.length AS ³¤¶È, COLUMNPROPERTY(a.id, a.name, 'PRECISION')
      AS ¾«¶È, ISNULL(COLUMNPROPERTY(a.id, a.name, 'Scale'), 0) AS СÊýλÊý,
      CASE WHEN a.isnullable = 1 THEN '√' ELSE '' END AS ÔÊÐí¿Õ, ISNULL(e.text, '')
      AS ĬÈÏÖµ, ISNULL(g.[value], '') AS ×Ö¶Î˵Ã÷, d.crdate AS ´´½¨Ê±¼ä,
      CASE WHEN a.colorder = 1 THEN d.refdate ELSE NULL END AS ¸ü¸Äʱ¼ä


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Tuning an Application / Reducing Load
If your whole application is performing suboptimally, or if you are attempting to
reduce the overall CPU or I/O load on the database server, then identifying
resource-intensive SQL involves the following steps:
1. Determine which period in the day you would ......

SQL Group By Top ʵÏÖ

DECLARE @temp TABLE(
id INT,
[name] VARCHAR(50),
class VARCHAR(50)
)
INSERT INTO @temp
SELECT 1,'a','A'
UNION ALL SELECT 2,'b','C'
UNION ALL SELECT 3,'c','B'
UNION ALL SELECT 4,'d','C'
UNION ALL SELECT 5,'e','B'
UNION ALL SELECT 6,'f','A'
SELECT * from @temp AS _temp WHERE [name] IN
( ......
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