mysql - 选择两个值并更新

Question

我想SELECT id, some_complex_calculations FROM some_table然后更新some_table以插入some_complex_calculations具有适当 ID 的其他列。我该怎么做？

Answer 1

尝试这个：

UPDATE some_table 
SET other_column = some_complex_calculations 
WHERE Id = 5; #appropiate ID

Answer 2

如果我理解您的要求，那么这就是您想要的，UPDATE 将替换现有行。但是你想插入行我猜，

INSERT INTO SOME_TABLE(YOUR_OTHER_COLUMN) 
VALUES(SELECT some_complex_calculations FROM some_table WHERE ID=4) #For Example