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[I have posted this in the Flow Control Functions page last year but I still see people asking how to update multiple rows.So, here it is again.]A very server resources friendly method to update multiple rows in the same table is by using WHEN THEN (with a very important note).
If you use an existing table, the steps in some of the procedures will not match your database exactly.Ideal when writing a script is just too much effort.Sometimes you have a lot of processes that could be updating a column value in a table. ID=54321 Here's a workaround for the update/subquery/cant do self table "bug"Senario is, ID 8 has multiple records, only the last (highest) record needs to be changedupdate t1 set c1 = ' NO'where id='8'order by recno desc limit 1I would prefer update t1 set c1=' NO' WHERE ID=8 AND RECNO = (SELECT MAX(RECNO) FROM T1 WHERE ID=8)But that's not currently allowed If you want to update a table based on an aggregate function applied to another table, you can use a correlated subquery, for example: UPDATE table1 SET table1field = (SELECT MAX(table2.table2field) FROM table2 WHERE table1.table1field = table2.table2field)This can be helpful if you need to create a temporary table storing an ID (for, say, a person) and a "last date" and already have another table storing all dates (for example, all dates of that person's orders).If you wish to use an increment based on subset of a table you may combine UPDATE with Variables:e.g.A table that contains entries of different categories, in which an internal order needs to represented ( lets say a table with busstops on different routes).
If you add new entries or move stops from one route to another you will most likely want to increment the position of the busstop within this route.