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 ...

通过以下命令查询长度 SELECT @@global.group_concat_max_len; show variables like "group_concat_max_len"; 使用以下语句设置长度： SET GLOBAL group_concat_max_len=102400; SET SESSION group_concat_max_len=102400 ...