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 ...
CONCAT function is mysql plays a vital role. The CONCAT() function combine or concatenate the list of strings together . We have 2 types of concat function -> CONCAT() – This function will concate ...
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 ...
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