When you write a query using the IN clause, you're telling the rule-based optimizer that you want the inner query to drive the outer query. When you write EXISTS in a where clause, you're telling the optimizer that you want the outer query to be run first, using each value to fetch...
WITH MEMBER [Date].[Calendar].[First8Months2003] AS Aggregate( PeriodsToDate( [Date].[Calendar].[Calendar Year], [Date].[Calendar].[Month].[August 2003] ) ) SELECT [Date].[Calendar].[First8Months2003] ON COLUMNS, [Product].[Category].Children ON ROWS FROM [Adventure Works] WHERE [Mea...
SELECT语句就像叠加在数据库表上的过滤器,利用SQL关键字从数据表中过滤出用户需要的数据。 注意事项 SELECT支持普通表和HDFS的Join,不支持普通表和GDS外表的join。即SELECT语句中不能同时出现普通表和GDS外表。 必须对每个在SELECT命令中使用的字段有SELECT权限。 使用FOR UPDATE或FOR SHARE还要求UPDATE权限。 尽量避免...
Transact-SQL 語法慣例 語法 SQL Server 和 Azure SQL Database 的語法: syntaxsql <SELECT statement>::=[WITH{ [XMLNAMESPACES, ] [<common_table_expression>[ , ...n ] ] } ]<query_expression>[ORDERBY<order_by_expression>] [<FOR Clause>] [OPTION(<query_hint>[ , ...n ] ) ]<query_exp...
WITH MEMBER [Date].[Calendar].[First8Months2003] AS Aggregate( PeriodsToDate( [Date].[Calendar].[Calendar Year], [Date].[Calendar].[Month].[August 2003] ) ) SELECT [Date].[Calendar].[First8Months2003] ON COLUMNS, [Product].[Category].Children ON ROWS FROM [Adventure Works] WHERE [Mea...
You can also use clauses like WHERE, GROUP BY, HAVING, ORDER BY with SELECT statement. We will discuss these commands in coming chapters. NOTE: In a SQL SELECT statement only SELECT and FROM statements are mandatory. Other clauses like WHERE, ORDER BY, GROUP BY, HAVING are optional.How ...
clause> ::= Cube_Name | [NON VISUAL] (SELECT [ * | ( <SELECT query axis clause> [ , <SELECT query axis clause>,...n ] ) ] FROM <SELECT subcube clause> <SELECT slicer axis clause> ) <SELECT slicer axis clause> ::= WHERE Tuple_Expression <SELECT cell property list clause> ::...
In SQL multiple fields may also be added with DISTINCT clause. DISTINCT will eliminate those rows where all the selected fields are identical. Contents: Sample Select statement Select with distinct on two columns Select with distinct on three columns ...
15.2.13 SELECT Statement SELECT[ALL|DISTINCT|DISTINCTROW][HIGH_PRIORITY][STRAIGHT_JOIN][SQL_SMALL_RESULT][SQL_BIG_RESULT][SQL_BUFFER_RESULT][SQL_NO_CACHE][SQL_CALC_FOUND_ROWS]select_expr[,select_expr]...[into_option][FROMtable_references[PARTITIONpartition_list]][WHEREwhere_condition][GROUPBY{...
In Databricks SQL, and starting with Databricks Runtime 12.2 this clause is deprecated. You should invoke a table valued generator function as a table_reference. WHERE Filters the result of the FROM clause based on the supplied predicates. GROUP BY The expressions that are used to group the ro...