Use a substitute for the NULL values. You will have to pick a suitable
substitute that doesn't confuse the other data. In this example I just
use 0 as the substitute value, you might prefer another based on the
true nature of your query (strings are also allowed).
SELECT ItemA, ISNULL(ItemB,0) AS ItemB, ISNULL(ItemC,0) AS ItemC
...
GROUP BY ItemA, ISNULL(ItemB,0) AS ItemB, ISNULL(ItemC,0) AS ItemC
ISNULL will return the first non-null value of the two parameters
given. COALESCE() performs a similar function and allows more parameters.
On 2017/05/02 9:54 PM, Joseph L. Casale wrote:
I have a query produced from several left joins which follows the format:
XXX ItemA NULL NULL
XXX ItemA ItemB NULL
XXX ItemA NULL ItemC
I need to group the data by all columns, column 0 is trivial, however columns
1:3 can collapse when any non null field matches. In the above case this could
collapse into a single line.
How can such a query be constructed?
Thanks,
jlc
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