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MySQL

MySQL, MariaDB, and general SQL tips, functions, and how-tos.

How to Insert Multiple Rows with MySQL (insert shortcut)

February 8, 2022 mike MySQL

Below is an example how to insert multiple values/rows into a table using a single insert statement shortcut. Versus individually listing out each insert statement

Sort Query By Length of String

December 19, 2018 mike MySQL

We’ll be using the MySQL built-in function char_length to demonstrate how to filter and sort based on a size of a columns width in characters.

Using Create/Select to Create a New Table From Another

December 8, 2018 mike MySQL

In a single statement you can copy the structure and data from one table in MySQL and populate the results of a query into the

String Concatenation Using concat Function

December 5, 2018 mike MySQL

Unlike SQL Server, String concatenation works using a function. It’s a simple function that you pass comma separated values into in the order you want

Query using Avg Ignoring Certain Values

December 3, 2018 mike MySQL

In this case we want to get the average of values but we also want to ignore certain values, say if when the deviceType column

Select Last N Characters of a Field

February 12, 2018 mike MySQL

Using the substring function, this example below will select the leftmost 6 characters from a string field named “field_name” in the table tbl_stuff with mysql.

Seeing Full Warnings That Just Happened After a Query

January 4, 2018 mike MySQL

After you run a query on MySQL server you may get warning messages. To see the complete warnings you simply run the command show warnings.

coalesce Function Handy for Outer Joins and Nulls

November 22, 2017 mike MySQL

The built-in function coalesce in MySQL is great for outer joins where the return or expected answer can be null. Coalesce can be used anytime

Ignoring Insert Errors

November 16, 2017 mike MySQL

In the MySQL sql language, the insert modifier ignore can sometimes come in handy if you’re wanting to run the query but not worry about

Parsing Date/Time From String

May 16, 2017 mike MySQL

This below would parse the string, in the specified format into a valid date time object. STR_TO_DATE only works when the date mask is valid

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