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Update statement - using substring

I have an update statement that currently looks like this...

UPDATE    tbldata
SET              data = (SELECT     tblEx.[4KD]
                           FROM         tblEx INNER JOIN
                                                  tblDa ON tblEx.ID = SUBSTRING(tblDa.Data, 1, 3))

The question I have is that my data column looks like this - 101000ABC and I don't want to set the entire column equal to the new value. I only want to update a part of it using substring, but I dont know the syntax of how to do that here. I have tried SET SUBSTRING(data,4,3) = .... but that did not work.

Thanks.
0
jandhb
Asked:
jandhb
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1 Solution
 
appariCommented:
try

UPDATE    tbldata
SET            data   = substring(data,1,3) + (SELECT     tblEx.[4KD]
                           FROM         tblEx INNER JOIN
                                                  tblDa ON tblEx.ID = SUBSTRING(tblDa.Data, 1, 3)) + substring(data,7,len(data)-7)
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
please try the following syntax:

UPDATE    tbldata
SET    data = tblEx.[4KD]
FROM  tblData        
INNER JOIN tblEx
  ON tblEx.ID = SUBSTRING(tblDa.Data, 1, 3))
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jandhbAuthor Commented:
angelll, yours had a syntax error.
appari, yours worked, almost. :) Here is what is going on. It updated both records in tbldata. In other words, I have two records in tblData that look like this...

101000ABC
202000DEF
 
And then in tblEx I have one record right now with an ID of 101. So...in this particular case it should have only updated the record starting with 101. Thoughts?
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
sorry, a ) too much at the end

UPDATE    tbldata
SET    data = tblEx.[4KD]
FROM  tblData        
INNER JOIN tblEx
  ON tblEx.ID = SUBSTRING(tblData.Data, 1, 3)
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jandhbAuthor Commented:
angelll, that is not what I'm looking for. Running that query replaces the data completely, not just the characters 4,3.

appari query does this and works, except for the issue I mentioned before about it updating all records.
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
ok:

UPDATE    tbldata
SET    data   = substring(data,1,3) + tblEx.[4KD]  + substring(data,7,len(data)-7)
FROM  tblData        
INNER JOIN tblEx
  ON tblEx.ID = SUBSTRING(tblData.Data, 1, 3)
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jandhbAuthor Commented:
angelll, that worked and I will award the points to you, but before I do may I ask one more question? How would update two parts of the string in tblData. Right now it is updating only the "x's" in this example here... 101XXXABC But what if I wanted to update it like this... 101XXXXXX Make sense?

In other words, I was trying something that like...

UPDATE    tbldata
SET    data   = substring(data,1,3) + tblEx.[4KDI]  + substring(data,7,len(data)-6),
SET    data   = substring(data,1,3) + tblEx.[STT]  + substring(data,7,len(data)-6)
FROM  tblData  
INNER JOIN tblEx
  ON tblEx.ID = SUBSTRING(tblData.Data, 1, 3)

But that did not quite work.
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
updating 2 parts is of course possible, but not sure what you mean exactly?
your explanation does not match the syntax try.
please retry to formulate the explanation...
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jandhbAuthor Commented:
Currently in tblData my string looks like this...

101000ABC

At this point with your previous solution the "000" is being updated with the 4KD data in tblEx. I am now asking how you would also update the "ABC" data with the STT data in tblEx.

Is that clear?
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
ok, so you mean this:
UPDATE    tbldata
SET    data   = substring(data,1,3) + tblEx.[4KDI]  + tblEx.[STT]  + substring(data,10,len(data)-9)
FROM  tblData  
INNER JOIN tblEx
  ON tblEx.ID = SUBSTRING(tblData.Data, 1, 3)
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jandhbAuthor Commented:
that is exactly right.

may i ask you what this portion means - substring(data,10,len(data)-9)
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
that gets the characters from position 10 to the end...
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