Convert negative data into positive data in SQL Server

Applying ABS function to an entire column

You might want to show some love to the whole column and update all negatives to positives. Combine the UPDATE statement with ABS:

UPDATE YourTable
SET YourColumn = ABS(YourColumn)
WHERE YourColumn < 0;
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PSA: Don't forget the WHERE clause, or you're throwing a positivity party everyone's invited to.

Hint: Testing makes perfect. Try this on a copy of the table first.

Conditional ABS application using CASE

Sometimes, you need to be selective with the positivity. You can use CASE:

UPDATE YourTable
SET YourColumn = CASE
                    WHEN YourColumn < 0 
                    THEN ABS(YourColumn) 
                    ELSE YourColumn -- "I'm positive enough, thank you."
                 END;


This way, positives remain generations old, and negatives get reborn as positives.

Extra tip: If you need a group therapy session, repeat this for all required columns.

ABS function with a performance tweak

In large databases, indiscriminate use of ABS can cause a performance hit. Here are some quick remedies:

• Use indexed columns: Databases love them!
• Try batch updates: SQL Server's way of handling stress.

And yes, always check the execution plan. It's the crystal ball of SQL Server.

ABS function with floating numbers

Working with floating-point numbers as precise as a surgeon's cut? Ensure the precision is intact:

SELECT CAST(ABS(YourColumn) AS FLOAT(53)) AS positive_output
FROM YourTable;
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This ensures not a single digit of precision is lost in the ABS journey.

Useful when your numbers need social distancing from integers.

Scripting best practices in SQL Server

Want to write a stellar script? Here's some scripting etiquette:

• Comments: Because over-communication is better than misunderstanding.
• Version control: Just like diary entries, but for your scripts.
• Backups: You fall, you rise.

Every good script is like a well-cooked meal: Always wash your hands first.