在PostgreSQL中,确实不存在group_concat函数,这个函数是MySQL特有的。当你在PostgreSQL中遇到错误“function group_concat(character varying) does not exist”时,你可以使用以下几种替代方法来实现类似的功能: 1. 使用string_agg函数 string_agg是PostgreSQL中用于将多个行的数据连接成一个字符串的聚合函数,与MySQL的gro...
1630 - FUNCTION group_concat does not exist. Check the 'Function Name Parsing and Resolution' section in the Reference Manual 问题分析: 1、group_concat后面多加了个空格。 select group_concat (username) from t_user; 解决办法:将group_concat后面的空格去掉。 select group_concat(username) from t_u...
[localhost:21000] > create table t1 (x int, s string); [localhost:21000] > insert into t1 values (1, "one"), (3, "three"), (2, "two"), (1, "one"); [localhost:21000] > select group_concat(s) from t1; +---+ | group_concat(s) | +---+ | one, three, two, one ...
MySQL中的函数(Function)是一组预先编写好的SQL语句,可以被调用来执行特定的任务。它们可以接受参数,返回值,并且可以在SQL语句中像普通值一样使用。 基础概念 MySQL函数分为两种类型: 内置函数:MySQL自带的函数,如CONCAT()、LENGTH()、NOW()等。 自定义函数:用户根据需要创建的函数。 相关优势 代码重用:函数可以在...
GROUP_CONCAT(expr [ORDER BY {unsigned_integer | col_name | expr} ASC | DESC] [SEPARATOR str_val]) expr:Expression to concatenate. ORDER BY:Optional clause to order concatenated values. SEPARATOR:Optional parameter to define the separator (default is comma). ...
alasql('SELECT Type,GROUP_CONCAT(Name) AS Names FROM ? GROUP BY Type',[[{Type:'PT',Name:'Steve'},{Type:'PT',Name:'Dan'}]]); returns Uncaught SyntaxError: Unexpected token ; should be [{Name: "Steve,Dan", Type: "PT"}] or, even better, unl...
GROUP_CONCAT_FUNC, // GROUP_CONCAT or GROUP_CONCAT DISTINCT JSON_AGG_FUNC, // JSON_ARRAYAGG and JSON_OBJECTAGG ROW_NUMBER_FUNC, // Window functions RANK_FUNC, DENSE_RANK_FUNC, CUME_DIST_FUNC, PERCENT_RANK_FUNC, NTILE_FUNC, LEAD_LAG_FUNC, ...
group_concat(X, Y) The group_concat() function returns a string which is the concatenation of all non-NULL values of X. If parameter Y is present then it is used as the separator between instances of X. A comma (",") is used as the separator if Y is omitted. The order of the ...
1.2.3 group_concat() 1.3 字符串的其他操作 1.3.1 len()与length() 1.3.2 field() 1.3.3 FIND_IN_SET() 1.3.4 ord()和ASCII() 1.3.5 upper()和lower() 1.3.6 INSERT() 1.3.7 LOCATE() 1.3.8 REPEAT() 1.3.9 SPACE() 2 数字函数 ...
This is the function MySQL GROUP CONCAT and how it can change the work with query results. Especially if the database is the data source for the appli...