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  1. stackoverflow.com › questions › 17265522sql - Conditional UPDATE in MySQL - Stack Overflow

    23 cze 2013 · I am trying to UPDATE values from a table, but I need to add some conditions. I found the function CASE, but I am not if it is the best method. Here is an example. My table is 'relation': userid1 | userid2 | name1 | name2 I got for example: SELECT * FROM relation WHERE (userid1 = 3 AND userid2 = 4) OR (userid1 = 4 AND userid2 = 3); Output:

  2. dba.stackexchange.com › questions › 21152mysql - How to update one table based on another table's values...

    19 lip 2012 · UPDATE ips INNER JOIN country ON ips.iso = country.iso SET ips.countryid = country.countryid Using MySQL update multiple table syntax: 14.2.11 UPDATE Syntax. Note that you have two different lengths and data types on your iso columns.

  3. dev.mysql.com › doc › enMySQL :: MySQL 8.4 Reference Manual :: 15.2.17 UPDATE Statement

    For the multiple-table syntax, UPDATE updates rows in each table named in table_references that satisfy the conditions. Each matching row is updated once, even if it matches the conditions multiple times.

  4. www.geeksforgeeks.org › how-to-update-table-rows-in-mysql-using-subqueryHow to Update Table Rows Using Subquery in MySQL - GeeksforGeeks

    26 cze 2024 · Updating table rows using subqueries in MySQL enables precise modifications based on specific conditions or values from other tables. This technique leverages subqueries within the SET or WHERE clauses of the UPDATE statement, allowing dynamic and context-specific updates.

  5. www.w3schools.com › mysql › mysql_updateMySQL UPDATE Statement - W3Schools

    UPDATE Table. The following SQL statement updates the first customer (CustomerID = 1) with a new contact person and a new city.

  6. medium.com › assoconnect › update-your-mysql-schema-a-million-rows-headache-freeUpdate your MySQL Schema & a Million Rows Headache-free: Part 2

    26 sty 2020 · Running an UPDATE statement when MySQL uses an InnoDB engine will set an exclusive lock on all related rows. Depending on the conditions you set in the WHERE clause, the entire table may...

  7. dev.mysql.com › doc › refmanMySQL :: MySQL 8.0 Reference Manual :: 13.2.13 UPDATE Statement

    For the multiple-table syntax, UPDATE updates rows in each table named in table_references that satisfy the conditions. Each matching row is updated once, even if it matches the conditions multiple times. For multiple-table syntax, ORDER BY and LIMIT cannot be used.

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