Updating a field in sql Naked girl datibg chat free

Posted by / 10-May-2020 11:01

Updating a field in sql

[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).

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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.

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