Here, the SQL command creates an index namedcollege_indexon theCollegestable using thecollege_codecolumn. SQL CREATE INDEX Syntax The syntax of the SQLCREATE INDEXstatement is: CREATEINDEXindex_nameONtable_name
CREATE INDEXThe CREATE INDEX command is used to create indexes in tables (allows duplicate values).Indexes are used to retrieve data from the database very fast. The users cannot see the indexes, they are just used to speed up searches/queries....
Learn more about the Microsoft.SqlServer.TransactSql.ScriptDom.CreateIndexStatement.CreateIndexStatement in the Microsoft.SqlServer.TransactSql.ScriptDom namespace.
CREATE UNIQUE INDEX index1 ON schema1.table1 (column1 DESC, column2 ASC, column3 DESC); 主要方案: 从Azure SQL 数据库和 Azure SQL 托管实例中的 SQL Server 2016(13.x)开始,可以在列存储索引上使用非聚集索引来提高数据仓库查询性能。 有关详细信息,请参阅 列存储索引 - 数据仓库。 有关其他类型...
Type the following SQL statement: ALTER TABLE Cars ADD COLUMN Condition TEXT(10) On the Design tab, in the Results group, click Run. Top of Page Create an index To create an index on an existing table, you use a CREATE INDEX command. A CREATE ...
sql-statement ::= CREATE [UNIQUE] INDEX [database-name .] index-name ON table-name ( column-name [, column-name]* )[ ON CONFLICT conflict-algorithm ] column-name ::= name [ COLLATE collation-name] [ ASC | DESC ] The CREATE INDEX command consists of the keywords "CREATE INDEX" foll...
Visual FoxPro uses the default value if you use the SQL ALTER TABLEcommand to remove autoincrementing for the field.PRIMARY KEY | UNIQUE PRIMARY KEY creates a primary index for the field specified in FieldName1. UNIQUE creates a candidate index for the field specified in FieldName1. The ...
. Then finally the index can be marked“valid” and ready for use, and theCREATE INDEXcommand terminates. Even then, however, the index may not be immediately usable for queries: in the worst case, it cannot be used as long as transactions exist that predate the start of the index build...
A virtual column is then generated transparently with the values in the SQL data type array; finally, a functional index (also referred to as a virtual index) is created on the virtual column. It is the functional index defined on the virtual column of values from the SQL data type array...
(MAX) =CONVERT(VARCHAR(MAX),CONVERT(VARBINARY(16), @objectId),1);-- Construct command: CREATE USER [@principal_name] WITH SID = @castObjectId, TYPE = E;DECLARE@cmdNVARCHAR(MAX) = N'CREATE USER ['+ @principal_name +'] WITH SID = '+ @castObjectId +', TYPE = E;'EXEC (@cmd)...