mysql中的group_concat https://www.yiibai.com/mysql/group_concat.html mysql中的concat https://www.cnblogs.com/yingmo/p/6148360.html group by、order by ...
GROUP_CONCAT, LISTAGG or some other name, depending on the SQL dialect, is an aggregation function which takes values from several rows and lists them in a single string, separated by some pre-defined ...
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