我在SQL Server 2017 中使用 STRING_AGG 函数。我想创建与COUNT(DISTINCT <column>)相同的效果。我试过STRING_AGG(DISTINCT <column>,',')但这不是合法的语法。 我想知道是否有 T-SQL 解决方法。这是我的示例: WITHSitingsAS(SELECT*FROM(VALUES(1,'Florida','Orlando','bird'), (2,'Florida','Orlando'...
Only one query plan is cached and used for all parameter values. This can cause a query plan to be inefficient for some values of the parameter, also known as a parameter sensitive plan. Parameterized queries can have multiple cached query plans for different selectivity categories of a ...
https://github.com/orlando-colamatteo/ms-sql-server-group-concat-sqlclr
In this query, we select the distinct hometown values from the “Hospital” table and use the STRING_AGG function to concatenate them. The DISTINCT keyword makes sure that the duplicate hometowns are removed and it results in a set of unique hometown values. Conclusion The SQL Server STRING_A...
This is an example as I do not know your schema.
STRING_AGGx--x COUNTxxxx COUNT(*)xxxx GROUPINGx--- The following shared properties apply here: The additionDISTINCTexcludes duplicate values from the calculation in any operand positions in which it is specified. If the argument of an aggregate function (exceptCOUNT) has thenull value, it is ...
DISTINCT 保留 保留 保留 保留 DLNEWCOPY 保留 保留 DLPREVIOUSCOPY 保留 保留 DLURLCOMPLETE 保留 保留 DLURLCOMPLETEONLY 保留 保留 DLURLCOMPLETEWRITE 保留 保留 DLURLPATH 保留 保留 DLURLPATHONLY 保留 保留 DLURLPATHWRITE 保留 保留 DLURLSCHEME 保留 保留 DLURLSERVER 保留 保留 DLVALUE 保...
select string_agg(sq.name) ,sq.id from ( select distinct a.name ,...
字符串常量是指由半角单引号(')包围的任意字符序列,例如'This is a string'。 从SQL引擎2.8.4.8版本开始,SQL的解析器新增了解析转义字符的功能。对于字符串常量中的反斜线(\)符号,解析器会结合后一个字符综合判断是否是要进行转义。具体规则如下:
只能在 SELECT INTO 陳述式的選取清單或 SET 陳述式右側的純量子查詢中指定 ARRAY_AGG 函數。 無法同時指定DISTINCT及ARRAY_AGG。 OLAP 規格不能在 WHERE 子句、VALUES 子句、GROUP BY 子句、HAVING 子句、START WITH 子句、CONNECT BY 子句或 JOIN 條件中使用。 OLAP規格無法用作SET陳述式、VALUES INTO陳述式、CA...