select 2,'钱' union all select 1,'孙' union all select 1,'李' union all select 2,'周' go 2.创建自定义字符串聚合函数 Create FUNCTION AggregateString ( @Id int ) RETURNS varchar(1024) AS BEGIN declare @Str varchar(1024) set @Str = '' select @Str = @Str + [Name] from Aggregat...
從所讀取的每個資料列,SQL Server 會接著擷取結果集所需的資料行,以供 SELECT 陳述式、聯結述詞或篩選述詞參考。注意 資料列模式執行針對 OLTP 案例非常...|--Stream Aggregate(GROUP BY:([ORDERS].[o_orderpriority]) DEFINE:([Expr1005]=COUNT(*))) |--Parallelism(Gather Streams, ORDER BY: ([ORDERS...
SELECT s.*,c.cno,c.grade FROM student s INNER JOIN coursegrade c ON s.no = c.sno WHERE c.cno='c01'; 内连接查询,SELECT s.*,c.cno,c.grade FROM student s INNER JOIN coursegrade c ON s.no = c.sno; 默认和SELECT s.*,c.cno,c.grade FROM student s, coursegrade c WHERE c.sno...
statement selectsallrowsifthereisnoWHEREclause.IntheWHEREexpression, you canuseanyofthe functionsandoperators that MySQL supports,exceptforaggregate (summary) functions. See http://dev.mysql.com/doc/refman/8.0/en/expressions.html,andhttp://dev.mysql.com/doc/refman/8.0/en/functions.html.SELECTcan ...
select @Str = @Str + [Name] from AggregationTable where [Id] = @Id return @Str END GO 3.执行下面的语句,并查看结果 复制代码代码如下: select dbo.AggregateString(Id),Id from AggregationTable group by Id 结果为: 4>通过xml操作 select stuff((select ','+title from tb for xml path('')...
STRING_AGGis an aggregate function that takes all expressions from rows and concatenates them into a single string. Expression values are implicitly converted to string types and then concatenated. The implicit conversion to strings follows the existing rules for data type conversions. For more informa...
STRING_AGGis an aggregate function that takes all expressions from rows and concatenates them into a single string. Expression values are implicitly converted to string types and then concatenated. The implicit conversion to strings follows the existing rules for data type conversions. For more informa...
CREATE OR REPLACE TYPE t_clob_agg AS OBJECT ( g_string clob, STATIC FUNCTION ODCIAggregateInitialize(sctx IN OUT t_clob_agg) RETURN NUMBER, MEMBER FUNCTION ODCIAggregateIterate(self IN OUT t_clob_agg, value IN clob) RETURN NUMBER, MEMBER FUNCTION ODCIAggregateTerminate(self IN t_clob_agg,...
-- NOTE: Currently Flink doesn't support evaluating individual window table-valued function, -- window table-valued function should be used with aggregate operation, -- this example is just used for explaining the syntax and the data produced by table-valued function. Flink SQL> SELECT * FROM...
String 和 binary 空间地理和实例(地理数据类型) 空间几何和实例(几何数据类型) 数据类型 XML DBCC 函数 语言元素 查询 查询 常规 SELECT FROM 以及 JOIN、APPLY 和 PIVOT FROM 以及 JOIN、APPLY 和 PIVOT FROM - 使用 PIVOT 和 UNPIVOT 在哪里 提示