Question

我有2张桌子＆＃34; animal_breeds＆＃34;和＆＃34; ztmp.ztmp_509810_anims_out＆＃34;。在＆＃34;动物繁殖＆＃34;每只动物都有关键和品种名称和百分比。很少有动物可能有2种不同的品种，不同的百分比。现在基于动物键入＆＃34; animals_breeds＆＃34;我想更新＆＃34; ztmp.ztmp_509810_anims_out＆＃34;

request.data

我正在使用这个我知道错误的代码

    update ztmp.ztmp_509810_anims_out
set
   alt_id1 = ab.breed
  ,alt_id2 = pcnt
  ,alt_id3 = ab.breed
  ,alt_id4 = pcnt 
  ,alt_id5 = ab.breed
  ,alt_id6 = pcnt 
  ,alt_id7 = ab.breed
  ,alt_id8 = pcnt 

 from animal_breeds ab
where ab.soc_code = ztmp_509810_anims_out.soc_code and ab.animals_key = ztmp_509810_anims_out.animals_key
  and ab.soc_code = 'AUNDB';

我可以在更新语句中使用for循环吗？

Answer 1

UPDATE ztmp.ztmp_509810_anims_out AS z
SET soc_code = q.soc_code,
    animals_key = q.animals_key,
    alt_id1 = breeds[1],
    alt_id2 = pcnts[1],
    alt_id3 = breeds[2],
    alt_id4 = pcnts[2]
FROM (SELECT soc_code, animals_key,
             array_agg(breed) breeds, array_agg(pcnt) pcnts
      FROM animal_breeds
      GROUP BY soc_code, animals_key
     ) q
WHERE z.soc_code = q.soc_code
  AND z.animals_key = q.animals_key;

如果每animals_key个品种数超过2个，请添加breeds[3]和pcnts[3]，依此类推。

从另一个表更新表

1 个答案: