TheSELECT DISTINCTstatement retrieves distinct values from a database table. Example -- select the unique ages from the Customers tableSELECTDISTINCTageFROMCustomers; Run Code Here, the SQL command selects only the unique values of age from theCustomerstable. Syntax of SQL SELECT DISTINCT SELECTDIS...
This SQL tutorial explains how to use the SQL DISTINCT clause with syntax and examples. The SQL DISTINCT clause is used to remove duplicates from the result set of a SELECT statement.
The T-SQL syntax uses atable value constructorto create a derived table. The selected data is inserted intolocal temporary tablecalled#PETSthat stays in scope until the query window until the session is closed. The following query can be re-executed anytime since the table is deleted and recr...
syntax WHERE Table1.Field1=Table2.Field1 AND Table2.Field2=Table3.Field1 AND Table3.Field2=Table1.Field2. 作为表主键的一部分的列必须首先按优先级顺序定义,后跟任何非主键列。 必须在临时列之前定义永久性列。 文本列的排序顺序未定义;但是,相同的文本值始终组合在一起。
FROM @var2; CREATE [EXTERNAL] TABLE [IF NOT EXISTS] table_name AS SELECT [ALL | DISTINCT] select_expr, select_expr, ... FROM @var4;] [...] Syntax description The script mode supports three types of statements: SET statements, DML statements, and some DDL statements. The DDL ...
syntaxsql复制 <query_hint>::={ {HASH|ORDER}GROUP| {CONCAT|HASH|MERGE}UNION| {LOOP|MERGE|HASH}JOIN|DISABLE_OPTIMIZED_PLAN_FORCING|EXPANDVIEWS|FAST<integer_value>|FORCEORDER| {FORCE|DISABLE}EXTERNALPUSHDOWN| {FORCE|DISABLE}SCALEOUTEXECUTION|IGNORE_NONCLUSTERED_COLUMNSTORE_INDEX|KEEPPLAN|KEEPFIXEDPLAN...
syntaxsql复制 <query_hint>::={ {HASH|ORDER}GROUP| {CONCAT|HASH|MERGE}UNION| {LOOP|MERGE|HASH}JOIN|DISABLE_OPTIMIZED_PLAN_FORCING|EXPANDVIEWS|FAST<integer_value>|FORCEORDER| {FORCE|DISABLE}EXTERNALPUSHDOWN| {FORCE|DISABLE}SCALEOUTEXECUTION|IGNORE_NONCLUSTERED_COLUMNSTORE_INDEX|KEEPPLAN|KEEP...
view used in this SQL script requires that a registered Spatial Cartridge partitioned table is specified. If the table is not registered, you can use the USER_TABLES view to select all the partition tables from the user's schema. To use the USER_TABLES view, use the following syntax: ...
Syntax for Transact-SQL multi-statement table-valued functions. syntaxsql 复制 CREATE [ OR ALTER ] FUNCTION [ schema_name. ] function_name ( [ { @parameter_name [ AS ] [ type_schema_name. ] parameter_data_type [ NULL ] [ = default ] [ READONLY ] } [ , ...n ] ] ) RETUR...
syntaxsql 複製 CREATE [ OR ALTER ] FUNCTION [ schema_name. ] function_name ( [ { @parameter_name [ AS ] [ type_schema_name. ] parameter_data_type [ NULL ] [ = default ] [ READONLY ] } [ , ...n ] ] ) RETURNS return_data_type [ WITH <function_option> [ , ...n ] ]...