ALTER TABLE ADD CONSTRAINT (PRIMARY KEY or UNIQUE) Index on a local temp tableClustered index Only one subclause is allowed at a time. For example, you can't add and drop PRIMARY KEY or UNIQUE constraints in the same ALTER TABLE statement. ALTER TABLE DROP CONSTRAINT (PRIMARY KEY or UNIQU...
ALTER TABLE ADD CONSTRAINT (PRIMARY KEY or UNIQUE) Index on a local temp tableClustered index Only one subclause is allowed at a time. For example, you can't add and drop PRIMARY KEY or UNIQUE constraints in the same A...
Below is an example of creating both a clustered and non-clustered index on a temp table.[cc lang=”sql”] CREATE TABLE #Users ( ID int IDENTITY(1,1), UserID int, UserName varchar(50) )INSERT INTO #Users ( UserID, UserName ) SELECT UserID = u.UserID ,UserName = u.UserName FROM...
SQL Server 索引结构及其使用(二) 一、深入浅出理解索引结构 改善SQL语句 很多人不知道SQL语句在SQL SERVER中是如何执行的,他们担心自己所写的SQL语句会被SQL SERVER误解。比如: select*from table1 where name=''zhangsan''and tID>10000 和执行: select*from table1 where tID>10000and name=''zhangsan'' 一...
Index on a local temp table Initial unique clustered index on a view Disabled clustered indexes Clustered columnstore indexes in SQL Server 2017 (14.x)) and earlier versions Nonclustered columnstore indexes in SQL Server 2016 (13.x)) and earlier versions Clustered index, if the underlying table...
Index on a local temp table Initial unique clustered index on a view Disabled clustered indexes Clustered columnstore indexes in SQL Server 2017 (14.x)) and earlier versions Nonclustered columnstore indexes in SQL Server 2016 (13.x)) and earlier versions Clustered index, if the underlying table...
when we create an index on a temp table, a sort operation is automatically done, which means an overhead time wise... later when the temporary table is used in a query then the optim...
db2inst1@DESKTOP-F5VOQKN:~$ db2 create temporary tablespace my_temp pagesize 32k managed by automatic storage bufferpool my_poolDB20000I The SQL command completed successfully. db2inst1@DESKTOP-F5VOQKN:~$ db2 -tvf test.db2create table "my_schema"."my_table" ( "id" INT NOT NULL...
greatsql>CREATETABLEt3 (ccc1INT, ccc2varchar(100)); greatsql>INSERTINTOt3VALUES(1,'aa1'),(2,'bb1'),(3,'cc1'),(4,'dd1'),(null,'ee'); greatsql>CREATEINDEX idx1ONt1(c2); greatsql>CREATEINDEX idx2ONt1(c2,date1); greatsql>CREATEINDEX idx2_1ONt2(cc2); ...
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