Updating a row in mysql
In this article I have discussed several ways to use such non-standard extensions in My SQL for performance and convenience. Not only does it potentially make code non-portable, it can encourage mediocrity by teaching bad habits instead of teaching people the “right” way to do things.For example, updating multiple tables in a single statement, or inserting and updating at the same time, are definitely strange and ugly things to do.It happens a lot when I’m working with a client who has multiple versions of data in different spreadsheets, and I’m tasked with tidying it all up, standardizing formatting and importing it into a relational database.I have to start with one spreadsheet, then insert and/or update the differences from the others.I am the author of High Performance My SQL and lots of open-source software for performance analysis, monitoring, and system administration.I contribute to various database communities such as Oracle, Postgre SQL, Redis and Mongo DB. From that example, let us take list_and edit_and continue with the list of steps stated above.With these steps, we should make little changes on list_and edit_
The HTML tags will recursively create with dynamic values for each iteration of the loop.I belive fully portable or “platform-independent” SQL is mostly a myth.Writing generic “standard” SQL to the lowest common denominator almost certainly results in under-utilizing the RDBMS’s abilities.If performance is the goal and the queries don’t need to be portable, I see no reason not to use the solution that performs best.If the software must support multiple database backends performance is critical, there’s probably no way to avoid writing different queries for each supported backend.
This article deals with selecting multiple rows for applying update/delete operations.