Can we update two tables in a single query in SQL?

Can we update two tables in a single query in SQL?

The short answer to that is no. While you can enter multiple tables in the from clause of an update statement, you can only specify a single table after the update keyword.

How do you update multiple tables into one query?

The most easiest and common way is to use join clause in the update statement and use multiple tables in the update statement.

1. UPDATE table 1.
2. SET Col 2 = t2.Col2,
3. Col 3 = t2.Col3.
4. FROM table1 t1.
5. INNER JOIN table 2 t2 ON t1.Col1 = t2.col1.
6. WHERE t1.Col1 IN (21,31)

How can I update two tables at a time in MySQL?

The syntax of the MySQL UPDATE JOIN is as follows:

1. UPDATE T1, T2, [INNER JOIN | LEFT JOIN] T1 ON T1.C1 = T2.
2. UPDATE T1, T2 SET T1.c2 = T2.c2, T2.c3 = expr WHERE T1.c1 = T2.c1 AND condition.
3. UPDATE T1,T2 INNER JOIN T2 ON T1.C1 = T2.C1 SET T1.C2 = T2.C2, T2.C3 = expr WHERE condition.

Can we update more than one table value at a single time?

you can’t update more than one table with a single update statement. you can’t update more than one table with a single update statement but you can place all updates in a single transaction so all updates will be commited or rolled back.

Can we update multiple rows in a single SQL statement?

Column values on multiple rows can be updated in a single UPDATE statement if the condition specified in WHERE clause matches multiple rows. In this case, the SET clause will be applied to all the matched rows.

How do you UPDATE multiple rows in a single query?

There are a couple of ways to do it. INSERT INTO students (id, score1, score2) VALUES (1, 5, 8), (2, 10, 8), (3, 8, 3), (4, 10, 7) ON DUPLICATE KEY UPDATE score1 = VALUES(score1), score2 = VALUES(score2);…How to update multiple rows at once in MySQL?

id	score1	score2
2	8	3
3	10	6
4	4	8

Can you do multiple changes to a table in one update?

However, for some strange reason you can’t do multiple changes to a table in a single UPDATE query like this: However, you can do a very interesting trick. You can combine an UPDATE with a CASE like this: The ELSE title is very important, otherwise you will overwrite the rest of the table with NULL.

How to update the database multiple times in a single query?

Here’s where the multiple updates in a single query trick comes into play. You can just create a long query to update the database and run it only once instead of hundreds of small queries (which in case you didn’t figure it out, would bring your database to its knees in many cases). So we can make a script to parse our logfile like this:

Can you do multiple inserts in a single update query?

As you might know it’s quite easy to make multiple INSERTs in a single query, like this: However, for some strange reason you can’t do multiple changes to a table in a single UPDATE query like this: However, you can do a very interesting trick. You can combine an UPDATE with a CASE like this:

Can you combine an update with a case in SQL?

You can combine an UPDATE with a CASE like this: The ELSE title is very important, otherwise you will overwrite the rest of the table with NULL. You might wonder why on earth you’d want to make multiple updates in a single query.

https://www.youtube.com/watch?v=-f90syKzqw4