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MySQL - UPDATE query based on SELECT Query
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You can actually do this one of two ways:
MySQL update join syntax:
UPDATE tableA a
INNER JOIN tableB b ON a.name_a = b.name_b
SET validation_check = if(start_dts > end_dts, 'VALID', '')
-- where clause can go here
ANSI SQL syntax:
UPDATE tableA SET validation_check =
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What is the colon operator in Ruby?
...t exactly does the : do? I read somewhere about how it's similar to a string, but somehow a symbol.
9 Answers
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What is token-based authentication?
I want to understand what token-based authentication means. I searched the internet but couldn't find anything understandable.
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Check if option is selected with jQuery, if not select a default
Using jQuery, how do you check if there is an option selected in a select menu, and if not, assign one of the options as selected.
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What's the difference between TRUNCATE and DELETE in SQL
What's the difference between TRUNCATE and DELETE in SQL?
32 Answers
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Repeat command automatically in Linux
Is it possible in Linux command line to have a command repeat every n seconds?
13 Answers
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Changing CSS Values with Javascript
It's easy to set inline CSS values with javascript. If I want to change the width and I have html like this:
9 Answers
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'dragleave' of parent element fires when dragging over children elements
I have the following HTML structure and I've attached the dragenter and dragleave events to the <div id="dropzone"> element.
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How to create enum like type in TypeScript?
I'm working on a definitions file for the Google maps API for TypeScript.
6 Answers
6
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Checking for a null int value from a Java ResultSet
In Java I'm trying to test for a null value, from a ResultSet, where the column is being cast to a primitive int type.
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