[Term Entry] SQL NULL SAFE EQUAL Operator

[SlappyChappy]

Description

Adding SQL NULL SAFE EQUAL operator to SQL concepts under docs/content/sql/concepts/operators/terms/null-safe-equal/null-safe-equal.md.

I am making this contribution as part of my Git & Github course on Codecademy.

Issue Solved

Closes #5166

Type of Change

• Adding a new entry

Checklist

• All writings are my own.
• My entry follows the Codecademy Docs style guide.
• My changes generate no new warnings.
• I have performed a self-review of my own writing and code.
• I have checked my entry and corrected any misspellings.
• I have made corresponding changes to the documentation if needed.
• I have confirmed my changes are not being pushed from my forked main branch.
• I have confirmed that I'm pushing from a new branch named after the changes I'm making.
• I have linked any issues that are relevant to this PR in the Issues Solved section.

[CLAassistant]

All committers have signed the CLA.

[SaviDahegaonkar]

Hey @SlappyChappy ,
I had a look at your PR and suggested a few changes to you that should be made asap to get it approved as a first review.

Thanks,
Savi

[SaviDahegaonkar]

Suggested change

	Description: 'Performs an inequality comparison similar to the '=' operator, using the logic of an XNOR gate. Can accept NULL as a value and will not output NULL.'
	Description: 'Performs an equality comparison similar to the '=' operator, using the logic of an XNOR gate. Can accept NULL as a value and ensures comparisons involving NULL do not result in NULL.

Here I have corrected inequality comparison to equality comparison because that is the correct logic for null safe equal operator in SQL.

[SaviDahegaonkar]

Suggested change

	Tags:
	- 'Operators'
	- 'Database'
	- 'Queries'
	- 'Tables'
	Tags:
	- 'Operators'
	- 'Database'
	- 'Queries'
	- 'Tables'

Include only those tags that are already present in the tags.md list and you can add one if you want to include it in your PR. Here operators is not part of the tags list so you can add it if you want it to be used.

[SaviDahegaonkar]

Suggested change

	The **'NULL SAFE EQUAL'** operator performs an equality comparison like the '=' operator. However it can also accept NULL values and never returns NULL, instead always returning TRUE or FALSE. It uses the logic of an XNOR gate to determine the value returned.
	The **`NULL SAFE EQUAL`** operator performs an equality comparison like the '=' operator. However, it can also accept NULL values and never returns NULL, instead always returning TRUE or FALSE. It uses the logic of an XNOR gate to determine the value returned.

[SaviDahegaonkar]

Suggested change

	The 'NULL SAFE EQUAL' function is useful for when an XNOR gate that can accept NULL values and always returns True or False is needed.
	The `NULL SAFE EQUAL` operator is useful when an XNOR-like logic is required for comparisons that can accept NULL values and always return True or False.

The NULL SAFE EQUAL is an operator so it must be enclosed in ..... backticks, also removed the function word as it is not a function.
Also, NULL SAFE EQUAL operator is useful when XNOR-like logic is required not literally an XNOR gate.

[SaviDahegaonkar]

Suggested change

	## MySQL Syntax
	## Syntax

Removed MYSQL as it is not necessary here, only the word syntax is sufficient.

[SaviDahegaonkar]

Hey @SlappyChappy ,
I had a look at your PR and suggested some changes to you. Please make them asap to get it approved

Thanks,
Savi

[SlappyChappy]

@SaviDahegaonkar I have made a second commit following the suggestions you have made. Please let me know if you have any other comments. One thing to note was that I am not fully sure of what you mean regarding the 'Operators' tag, as when I looked in docs/documentation/tags.md, I was able to find it in there, so please let me know if I need to modify the tags section again.

[SaviDahegaonkar]

Hey @SlappyChappy ,
I had a look at your PR. I have suggested a few more changes to you please make them asap.

Thanks,
Savi

[SaviDahegaonkar]

Suggested change

	The 'NULL SAFE EQUAL' operator is useful for when XNOR-like logic is required for comparisons that can accept NULL values and always return True or False is needed.
	The `NULL SAFE EQUAL` operator is useful when XNOR-like logic is required for comparisons that can accept NULL values and always return True or False.

NULL SAFE EQUAL is an operator therefore it must be enclosed in (.....) backticks.

[SaviDahegaonkar]

Suggested change

	```pseudo
	SELECT column1
	FROM table
	WHERE column1 <=> condition
	```
	```pseudo
	SELECT column1
	FROM table
	WHERE column1 <=> value;

The NULL SAFE EQUAL operator <=> does the comparison between two values , not with the word "condition".

[SlappyChappy]

@SaviDahegaonkar I have incorporated your suggestions. Please let me know if there is anything else to amend. Thank you.