mysql - 发生数据库错误 SELECT 列表的表达式 #2 不在 GROUP BY 子句中并且包含非聚合列

Question

我有这个问题

SELECT substring(TGLLAHIR, 1, 7) as TGLLAHIR_,
       substring(TGLLAHIR, 5, 2) as BULAN, `TGLLAHIR` as `TGL`
FROM `m_pasien` 
WHERE substring(TGLLAHIR,1,4) = '2013' 
GROUP BY substring(TGLLAHIR, 1, 7) 
ORDER BY `TGLLAHIR` ASC

但是消息显示错误

Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'rsukemba_kojarsuk.m_pasien.TGLLAHIR' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

我该如何解决？

Answer 1

你不需要group by，而是使用distinct

SELECT  distinct 
        substring(TGLLAHIR, 1, 7) as TGLLAHIR_
       ,substring(TGLLAHIR, 5, 2) as BULAN
       ,`TGLLAHIR` as `TGL` 
FROM `m_pasien` 
WHERE substring(TGLLAHIR,1,4) = '2013' 
ORDER BY `TGLLAHIR` ASC