MySQL Archives - Belchamber Web Tools, AI Guidance & Code

MySQL DATE_FORMAT: Grouping Date & Time value fields into single days made easy

Aaron Belchamber — Thu, 24 Sep 2015 15:13:37 +0000

To conform a datetime field to just a date in your results and make it easy to group TIMESTAMP fields in the format “2015-12-25 12:23:23” so you can group any datetime value into actual days for daily reports, use “DATE_FORMAT” below: DATE_FORMAT(datetime_field, '%Y-%m-%d') In other words, if you have values from a SELECT statement that […]

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Planning to design or redesign an organization’s database? Get back to basics and refer to MySQL’s reserved keyword list

Aaron Belchamber — Wed, 17 Jun 2015 01:49:58 +0000

Oracle’s MySQL is a staple in the open source web environment world. Being familiar with the reserved words the database uses is just one way to make sure you don’t have to refactor code or special-escape field names in queries later with the menacing back tick: ` Here is the link to MySQL’s reserved keyword’s […]

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MySQL: Using sub-selects to filter results of one table that is not contained in another table

Aaron Belchamber — Tue, 17 Mar 2015 00:57:20 +0000

In MySQL, if you have two tables with a shared index and you would like to show the results of one table where the index is not within another table, you can use “NOT IN”. SELECT * FROM table2 WHERE some_field not in (SELECT some_field FROM table1) Try Googling “MySQL NOT IN” and you get […]

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MySQL: Dealing with time and date/time database values set inside fields that are defined as text, strings, or mediumtext

Aaron Belchamber — Fri, 29 Aug 2014 11:03:28 +0000

It’s happened to all of us at some point. You take over a project and some knucklehead who designed the database was too lazy to optimize it. This usually means you will end up with fields named “DateBought” and though it’s supposed to always hold a date and/or datetime value, it’s defined as some VARCHAR […]

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Changing MySQL “INSERT INTO” into “INSERT IGNORE INTO” can solve a lot of headaches when batch importing a lot of records

Aaron Belchamber — Thu, 28 Aug 2014 11:37:37 +0000

Inserting a batch of records into MySQL will stop on the first instance the record already exists with a matching PRIMARY KEY. If you’re at risk of this happening, open the .sql file and use your text editor to search for “INSERT INTO” and replace it with “INSERT IGNORE INTO” and this will skip any […]

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Designing a database? Consider MySQL Workbench

Aaron Belchamber — Thu, 22 May 2014 02:50:25 +0000

My love affair with MySQL has spanned over a decade. I wondered what the repercussions of Oracle buying MySQL would be, still not sure. There are conspiracies out there, like this article which helps fuel the fire of skepticism. It’s a little scary because MySQL was supposed to be the open-source solution to the corporate, […]

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Properly tabulating a report of various results from a survey with a MySQL query

Aaron Belchamber — Thu, 27 Mar 2014 00:14:56 +0000

Let’s say you have a basic survey database table where it records a response in the “response” field that will contain different values depending on the survey questions. Now, it’s pretty easy to gather the value of each response and tabulate the quantity of each response in a list like so: “Yes” 50 responses “Maybe” […]

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