Posted on November 23, 2009 by Derek Dieter 14 4 « Create Index on Temp Table Beginning of Month » Creating an index on a table variable can be done implicitly within the declaration of the table variable by defining a primary key and creating unique constraints. The primary key will ...
CREATE CLUSTERED INDEX IDX_C_Users_UserID ON #Users(UserID) CREATE INDEX IDX_Users_UserName ON #Users(UserName) [/cc] Even though you can implicitly create a clustered index on a table variable (@table) by defining a primary key or unique constraint, it is generally more efficient to use...
Creates a unique index on a table or view. A unique index is one in which no two rows are permitted to have the same index key value. A clustered index on a view must be unique.The Database Engine doesn't allow creating a unique index on columns that already include duplicate values,...
Creates a unique index on a table or view. A unique index is one in which no two rows are permitted to have the same index key value. A clustered index on a view must be unique.The Database Engine doesn't allow creating a unique index on columns that already include duplicate values,...
CreateExternalTableStatement CreateFederationStatement CreateFullTextCatalogStatement CreateFullTextIndexStatement CreateFullTextStopListStatement CreateFunctionStatement CreateIndexStatement CreateIndexStatement 建構函式 屬性 已叢集化 資料行 FileStreamOn FilterPredicate IncludeColumns OnFileGroupOrP...
Up to 16 columns can be combined into a single composite index key. All the columns in a composite index key must be in the same table or view. The maximum allowable size of the combined index values is 900 bytes. For more information about variable type columns in composite indexes, see...
Description:When you create an index on table in uppercase, after update the table name is converted to lowercase.How to repeat:SHOW VARIABLES LIKE 'lower_case_%'; Variable_name Value --- --- lower_case_file_system ON lower_case_table_names 2 SHOW VARIABLES LIKE 'version%'; Variable_na...
( <index_option> [ , ...n ] ) ] | [ FOREIGN KEY ] REFERENCES referenced_table_name [ (ref_column ) ] [ ON DELETE { NO ACTION | CASCADE } ] [ ON UPDATE { NO ACTION } ] [ NOT FOR REPLICATION ] | CHECK [ NOT FOR REPLICATION ] (logical_expression ) [ ON { partition_...
The CREATE INDEX statement is used to define an index on a database table. An index can be defined on XML data, or on relational data. The CREATE INDEX statement is also used to create an index specification (metadata that indicates to the optimizer that a data source table has an index...
This reduces the reusability of your index. So it's better to avoid function-based indexes if you can. Instead move the calculation off the column to the variable. Examples include:Simple formulasUsing standard math, rearrange the formula so there are no functions on the column:...