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Stairway to T-SQL: Beyond The Basics Level 7: Controlling the Flow of Your T-SQL


Stairway to T-SQL: Beyond The Basics Level 7: Controlling the Flow of Your T-SQL

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Greg Larsen
Greg Larsen
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Comments posted to this topic are about the item Stairway to T-SQL: Beyond The Basics Level 7: Controlling the Flow of Your T-SQL

Gregory A. Larsen, MVP
Marcia J
Marcia J
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What are some real-life examples of using the While statement that don't involve RBAR code?
Bangaaram
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I made a slight change to your code:

DECLARE @I INT = 0;
WHILE @I <= 10
BEGIN
IF @I%2 = 0
IF TAN(@I) > 0
PRINT 'Value ' + CAST(@I as char(1)) + ' is EVEN and the TANGENT is greater than zero'
ELSE
PRINT 'Value ' + CAST(@I as char(1)) + ' is EVEN and the TANGENT is less than or equal to zero'
ELSE
IF TAN(@I) > 0
PRINT 'Value ' + CAST(@I as char(1)) + ' is ODD and the TANGENT is greater than zero'
ELSE
PRINT 'Value ' + CAST(@I as char(1)) + ' is ODD and the TANGENT is less than or equal to zero'
SET @I += 1;
END



And the output I got is:
Value 0 is EVEN and the TANGENT is less than or equal to zero
Value 1 is ODD and the TANGENT is greater than zero
Value 2 is EVEN and the TANGENT is less than or equal to zero
Value 3 is ODD and the TANGENT is less than or equal to zero
Value 4 is EVEN and the TANGENT is greater than zero
Value 5 is ODD and the TANGENT is less than or equal to zero
Value 6 is EVEN and the TANGENT is less than or equal to zero
Value 7 is ODD and the TANGENT is greater than zero
Value 8 is EVEN and the TANGENT is less than or equal to zero
Value 9 is ODD and the TANGENT is less than or equal to zero
Value * is EVEN and the TANGENT is greater than zero


How do I handle this?

-----------------------------------------------------------------------
Known is a DROP, Unknown is an OCEAN.Ermm
Jeff Moden
Jeff Moden
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Marcia J (6/25/2014)
What are some real-life examples of using the While statement that don't involve RBAR code?


Creating dynamic SQL for backups.

The "Bin Fill" and "Load Balancing" problems are classic problems that are difficult to solve without an explicit loop.

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

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