This function returns a string resulting from the concatenation, or joining, of two or more string values in an end-to-end manner. It separates those concatenated string values with the delimiter ...

The full form of CONCAT_WS is concatenate with Separator which is a special form of CONCAT(). The first argument in CONCAT_WS is used as a separator for concatenate all other arguments. The separator ...

This article explains the MySQL string functions which are used to concatenate two or more strings. 1. CONCAT : CONCAT() function is used to generate a string by concatenating two or more strings. The ...

目前项目中对于多列的聚合使用到了concat_ws来实现，但是使用concat_ws合并多列后，返回的结果只能是10条，如 select sum(pv) from index group by concat_ws(",",col1,col2) 转化为elasticsearch语句后为 ...