SQL - Combine multiple fields from a table into a single column


I'm trying to concatenate the values in multiple columns into a string in another column.

Here is some SQL:
CREATE TABLE #tmpExample ( 
    column1 varchar(255),
    column2 varchar(255),
    column3 varchar(255),
	column4 varchar(255)
INSERT INTO #tmpExample  
('1', 'A', 'B', 'C'),
('2', 'D', 'E', 'F'),
('3', 'G', 'H', 'I'),
('4', '', '4', 'ME');

ALTER TABLE #tmpExample
ADD columns2_4 varchar(255)

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Given that data I would like to write a statement that results in the following in "columns2_4":

I'm hungry right now and so I'm thinking ISNULL(COLUMN2, 'PIZZA').

Actually any NULL in column 2,3, or 4 should return pizza (I'm REALLY hungry).  

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Brendt HessSenior DBACommented:
Note that Row 4, column 2, is not NULL - it is an empty string, which is a different thing, and changes the code. If you want to handle both empty strings and NULLs, then add this to the end of your code:

UPDATE #tmpExample
SET columns2_4 = CONCAT(ISNULL(NULLIF(column2, ''), 'PIZZA'), ISNULL(NULLIF(column3, ''), 'PIZZA'), ISNULL(NULLIF(column4, ''), 'PIZZA'))

FROM #tmpExample

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ttist25Author Commented:
Great thanks Brendt!
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Microsoft SQL Server

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