Grouping on the field created with substr
I don't know how to get around this problem.Here are the contents of the field, point, I need to group by. The name of the element is actually the string AFTER the 'Test' and BEFORE 'Hour '.
TestNodAHour-03
TestNodCHour-00
TestNodBHour-01
TestNodDHour-02
Thus, in the example above, the element names would be "NodA", "NodC', 'NodB', 'NodD '.
I need to enter charges for these items (i.e. the substrings) names and come up with totals, so I tried the following:
SELECT
SUBSTR ( item , 5 , 4 ) AS Item ,
COUNT(*)
FROM
table_name
WHERE
Item_Type = '666'
GROUP BY item
ORDER BY item
The report header now has the right name, but the data are actually get wrapped by long names - the names actually in the fields. Is there anyway to group by the substr? Or I approach this all wrong?Brad
Hello
When you assign a column alias in a query, you can use it in the ORDER BY clause, but nowhere else in the same query.
So, when you are referring to 'article' in the GROUP BY clause, referring to the column called point, not the called alias element.
Using a column as an alias is confusing name. try to avoid this.
You can repeat the expression in the GROUP BY clause:
SELECT
SUBSTR ( item , 5 , 4 ) AS Item ,
COUNT(*)
FROM
table_name
WHERE
Item_Type = '666'
GROUP BY SUBSTR ( item , 5 , 4 )
ORDER BY item
or you can assign the alias in a subquery. Then, it can be used in the GROUP BY clause (or elsewhere) in the Super-requete:
WITH reduce_item AS
(
SELECT
SUBSTR ( item , 5 , 4 ) AS Item ,
FROM
table_name
WHERE
Item_Type = '666'
)
SELECT item
, COUNT (*)
FROM reduce_item
GROUP BY item
ORDER BY item
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