NULL in SQL

Hi Experts,

I do have value for stTRGT and line 4 - shftTRGT is 'NULL' (correct value). While in line 5 while trying to sum, i do get NULL instead of value of stTRGT.  
Please do advice.

	SET timeOUT = TIMESTAMPDIFF(SECOND,timeIN,now());
	SET stTRGT = timeOUT / 3.5;
	
	SET shftTRGT =(select sum(sec) from workinghrs where endTM <= timeIN);
	SET shftTRGT = shftTRGT + stTRGT;
/*

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Rama TitoProgrammerAsked:
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Pavel GushchinProgrammerCommented:
If you add NULL and any number you will always get NULL.
You need to change 5 line so:
SET shftTRGT = COALESCE(shftTRGT,0) + stTRGT;

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Paul JacksonSoftware EngineerCommented:
By default concatenating with a null in tsql results in a null, you need to use COALESCE :

SET shftTRGT = COALESCE(shftTRGT, ' ') + stTRGT;

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Rama TitoProgrammerAuthor Commented:
Thank you Experts, do appreciate most.
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