总而言之,MSSQL文本拼接是一种常用的数据处理方法,用户可以通过使用Transact-SQL的“+”运算符来拼接一个字符串;同样用户还可以使用STUFF函数和FOR XML PATH函数来实现MSSQL文本拼接操作;此外,MSSQL Server也提供了STRING_AGG函数用于拼接字符串。
mssql 2012中的concat和distinct组你可以用STRING_AGG()具有窗口功能：
STRING_AGG(FieldB, ‘,’ ORDER BY FieldB) AS FieldBs FROM TableName GROUP BY FieldA ORDER ...
Distinct 聚合。 ROLLUP、CUBE 和 GROUPING SETS 支持聚合 AVG (DISTINCT column_name)、COUNT (DISTINCT column_name) 和 SUM (DISTINCT column_name) 。 WHERE 子句: 执行任何分组操作之前,SQL 会删除不满足 WHERE 子句中条件的行。 HAVING 子句: SQL 使用 having 子句来筛选结果集内的组。
Fokus je na MS SQL 2022 no vidjeti ćemo i neke uvedene i poboljšane od 2016+. IS NOT DISTINCT, DATE_BUCKET, STRING_SPLIT, STRING_AGG, GENERATE_SERIES su samo neke od od funkcija koje ćemo obraditi. Novost je također i pozvanje API-a direktno iz SQL koda uz pomoć...
SQL COUNT vs COUNT(DISTINCT) Setup The following code creates a temporary table with four rows. There are two string columns (varchar data type), one numeric column, and one date column. One of the string columns allows NULL values while the other does not. Here is the syntax: ...
2.1.2.133 S071, SQL paths in function and type name resolution 2.1.2.134 S081, Subtables 2.1.2.135 S091, Basic array support 2.1.2.136 S091-01, Arrays of built-in data types 2.1.2.137 S091-02, Arrays of distinct types 2.1.2.138 S091-03, Array expressions 2.1.2.139 S092, ...
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conforming SQL language shall not contain a <binary value function>. Subclause 8.5, "<like predicate>": <octet like predicate> ::= <row value predicand> <octet like predicate part 2> <octet like predicate part 2> ::= [ NOT ] LIKE <octet pattern> [ ESCAPE <escape octet> ] <o...
APPROX_COUNT_DISTINCT AVG CHECKSUM_AGG COUNT COUNT_BIG GROUPING GROUPING_ID MAX MIN STDEV STDEVP STRING_AGG SUM VAR VARP 另请参阅 内置函数 (Transact-SQL) OVER 子句 (Transact-SQL) 反馈 此页面是否有帮助? 是否 提供产品反馈|在 Microsoft Q&A 获取帮助...