python - 如何在多个条件下更新值

Question

我有下表:

id - phone - value
1  - 1234  - null
2  - 4321  - null
3  - 1234  - null

我需要用 max(id) 的电话“1234”更新“值”列

id - phone - value
1  - 1234  - null
2  - 4321  - null
3  - 1234  - *updated

我尝试通过以下查询多次执行此操作:

cur.execute("UPDATE online_booking SET st1 = (%s) HAVING max(ID) and phone = (%s)", (st1, phone))

但它说“在“HAVING”处或附近出现语法错误”

Answer 1

您应该通过这样的子查询过滤 id:

UPDATE online_booking 
SET st1 = '*update' 
WHERE id = (
    SELECT max(id)
    FROM online_booking
    WHERE phone = '1234')