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Posted by / 31-Mar-2019 06:04

Updating sql record

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.Getting the most from my software is more important than dreaming of “platform-independent” queries.

Besides instantiating the object you need just two lines of code to get a result from the database in a variety of formats.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.In this article I’ll give an overview of each feature, help you understand how to choose among them, and point out some things to watch out for. I assume My ISAM tables without support for transactions, with the following sample data: create table t1 ( a int not null primary key, b int not null, c int not null ) type=My ISAM; create table t2 ( d int not null primary key, e int not null, f int not null ) type=My ISAM; insert into t1 (a, b, c) values (1, 2, 3), (2, 4, 6), (3, 6, 9); insert into t2 (d, e, f) values (1, 1, 1), (4, 4, 4), (5, 5, 5);.Recall that in My SQL, a primary key is simply a unique index named PRIMARY.

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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.

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