语法如下:
group_concat([DISTINCT] 要连接的字段 [Order BY ASC/DESC 排序字段][Separator '分隔符'])
表数据:
+------+------+ | code| invoiceNO | +------+------+ |1 | 110| |1 | 3| |1 | 20| |2 | 20| |3 | 240 | |3 | 12| +------+------+
以code分组,把invoiceNO 字段的值打印在一行,逗号分隔(默认)
,sql如下:
select code,group_concat(invoiceNO)as invoiceNO from 表名 group by code;
结果:
+------+--------------------+ | code| invoiceNO | +------+--------------------+ |1 | 110,3,20| |2 | 20 | |3 | 240,12| +------+--------------------+
如果需要改变分割符,sql如下:
select code,group_concat(invoiceNO separator '/')as invoiceNO from 表名 group by code;
结果:
+------+--------------------+ | code| invoiceNO | +------+--------------------+ |1 | 110/3/20| |2 | 20 | |3 | 240/12| +------+--------------------+