詳解sqlserver查詢表索引
阿新 • • 發佈:2017-07-27
ron radi type str constrain lai int col 有用
SELECT 索引名稱=a.name
,表名=c.name
,索引字段名=d.name
,索引字段位置=d.colid
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FROM sysindexes a
JOIN sysindexkeys b ON a.id=b.id AND a.indid=b.indid
JOIN sysobjects c ON b.id=c.id
JOIN syscolumns d ON b.id=d.id AND b.colid=d.colid
WHERE a.indid NOT IN (0,255)
-- and c.xtype=‘U‘ and c.status>0 --查所有用戶表
AND c. name = ‘message‘ --查指定表
ORDER BY c. name ,a. name ,d. name
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需創建索引 例如:
根據某列判斷是否有重復記錄,如果該列為非主鍵,則創建索引
根據經常查詢的列,創建索引
無須創建索引
字段內容大部分一樣,例如:男,女
不要給所有的列都創建索引,這樣在創建新記錄時,增加維護開銷時間。
Oracle 查詢用戶表索引
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select index_name,index_type,table_name from user_indexes where table_name= ‘表名‘
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SqlServer查詢一個表上的索引
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SELECT
TableId=O.[object_id],
TableName=O. Name ,
IndexId= ISNULL (KC.[object_id],IDX.index_id),
IndexName=IDX. Name ,
IndexType= ISNULL (KC.type_desc, ‘Index‘ ),
Index_Column_id=IDXC.index_column_id,
ColumnID=C.Column_id,
ColumnName=C. Name ,
Sort= CASE INDEXKEY_PROPERTY(IDXC.[object_id],IDXC.index_id,IDXC.index_column_id, ‘IsDescending‘ )
WHEN 1 THEN ‘DESC‘ WHEN 0 THEN ‘ASC‘ ELSE ‘‘ END ,
PrimaryKey= CASE WHEN IDX.is_primary_key=1 THEN N ‘√‘ ELSE N ‘‘ END ,
[UQIQUE]= CASE WHEN IDX.is_unique=1 THEN N ‘√‘ ELSE N ‘‘ END ,
Ignore_dup_key= CASE WHEN IDX.ignore_dup_key=1 THEN N ‘√‘ ELSE N ‘‘ END ,
Disabled= CASE WHEN IDX.is_disabled=1 THEN N ‘√‘ ELSE N ‘‘ END ,
Fill_factor=IDX.fill_factor,
Padded= CASE WHEN IDX.is_padded=1 THEN N ‘√‘ ELSE N ‘‘ END
FROM sys.indexes IDX
INNER JOIN sys.index_columns IDXC
ON IDX.[object_id]=IDXC.[object_id]
AND IDX.index_id=IDXC.index_id
LEFT JOIN sys.key_constraints KC
ON IDX.[object_id]=KC.[parent_object_id]
AND IDX.index_id=KC.unique_index_id
INNER JOIN sys.objects O
ON O.[object_id]=IDX.[object_id]
INNER JOIN sys.columns C
ON O.[object_id]=C.[object_id]
AND O.type= ‘U‘
AND O.is_ms_shipped=0
AND IDXC.Column_id=C.Column_id where O. name = ‘cz201‘ --cz201是你要查詢的表
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以上內容就是本文全部所述,希望大家喜歡。
詳解sqlserver查詢表索引