当与其他值匹配时，MySql更新值

Question

我尝试在与其他值匹配时更新列中的特定值。

Database = wpddz_rg_lead_detail

如果与field_number 23值（蓝色圆圈）匹配，我需要在值列（field_number 21 =红色圆圈）中更新0（假设为5）。

field_number 23值（蓝色圆圈）的值是我可以传递给查询的变量

UPDATE wpddz_rg_lead_detail SET VALUE = 100 WHERE field_number = 21

做得对，但我需要首先检查我的变量= = de value from field_number 23

有没有人可以帮我解决问题？

编辑＆amp;溶液

Thx @Alex

UPDATE wpddz_rg_lead_detail AS a
JOIN wpddz_rg_lead_detail AS b
  ON a.lead_id = b.lead_id
  AND a.form_id = b.form_id
  AND b.field_number = 23
  AND b.value = '0e71f6d7abc70b41704faf98302a1d689a4cd80a' 
SET a.value = a.value+100
 WHERE a.form_id=2
 AND a.field_number = 21

Answer 1

UPDATE t t1
JOIN t t2
ON t1.lead_id=t2.lead_id
  AND t1.form_id = t2.form_id
  AND t2.field_number = 23
  AND t2.value IS NOT NULL # here you can set whatever condition for 23 field
SET t1.`value`=5
WHERE 
  t1.lead_id=4
  AND t1.form_id=2
  AND t1.field_number=21