用子查询更新MySQL中的表

Question

I would like to update my table with WHERE clause equals to result in my Subquery as you can see in the query below. The result after executing of query should be that the row with name Robert will have value to 1

CREATE TABLE `table1`(
  `name` varchar(30),
  `surname` varchar(30),
  `nextname` varchar(30),
  `value` bit(1)
);



INSERT INTO `table1` 
VALUES
  ('Daniel', 'Hanks', 'Robert', 0),
  ('Robert', 'Pitt', 'Angelina', 0),
  ('Angelina', 'Jolie', 'Monica', 0),
  ('Monica', 'Red', null, 0);



UPDATE `table1` SET `value` = 1 
WHERE `name` IN (SELECT `nextname` FROM `table1`
WHERE `name` = 'Daniel')¨

Thanks

Answer 1

You can't UPDATE and SELECT from the same table in one query. But MySQL does support UPDATE with JOIN syntax:

UPDATE table1 AS t1
INNER JOIN table1 AS t2 ON t1.name = t2.nextname
SET t1.value = 1 
WHERE t2.name = 'Daniel'

Answer 2

You can also do it with an ugly trick:

UPDATE `table1` SET `value` = 1 
WHERE `name` IN (SELECT `nextname` FROM(SELECT `nextname` FROM `table1`
WHERE `name` = 'Daniel')x)

Answer 3

Your syntax for using a subquery in the WHERE clause is correct. However what are you trying to do exactly? You can achieve the same result without the subquery.

UPDATE `table1` SET `value` = 1 WHERE `name` = 'Daniel'