Question

这是我的课程：

class Tizz(models.Model):
    key = models.PositiveIntegerField(default=0)
    name = models.CharField(max_length=20)
    value = models.CharField(max_length=500)

我的查询：

qs = Tizz.objects.values('key').annotate(
    hand=Concat(Case(When(column_name='hand', then=F('value'))), Value(''), output_field=CharField()),
    maintain=Concat(Case(When(column_name='maintain', then=F('value'))), Value(''), output_field=CharField()),
    pkey=Count('key')
)

str（qs.query）给我错误的SQL

SELECT "app_tizz"."key", COALESCE(CASE WHEN "app_tizz"."name" = hand THEN "app_tizz"."value" ELSE NULL END, ) || COALESCE(, ) AS "hand", COALESCE(CASE WHEN "app_tizz"."name" = maintain THEN "app_tizz"."value" ELSE NULL END, ) || COALESCE(, ) AS "maintain", COUNT("app_tizz"."key") AS "pkey" FROM "app_tizz" GROUP BY "app_tizz"."primary_key", COALESCE(CASE WHEN "app_celltizz"."name" = hand THEN "app_tizz"."value" ELSE NULL END, ) || COALESCE(, ), COALESCE(CASE WHEN "app_tizz"."name" = maintain THEN "app_tizz"."value" ELSE NULL END, ) || COALESCE(, )

在GROUP BY之后始终添加其他情况。为什么会这样？

Django group by无法正常工作

0 个答案: