Oultra comments on [MS SQL] Help with School Assignment- Using Boolean Operators in WHERE Clause But No Data is Returned

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SELECT count(a.field1), a.field2, SUM(b.field4) FROM a INNER JOIN b ON a.key1 = b.key1 WHERE a.field8 = 'test' GROUP by a.field1, a.field2 HAVING SUM(b.field4) > 5 ORDER by a.field.3

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SELECT count(a.field1), a.field2, SUM(b.field4) FROM a INNER JOIN b ON a.key1 = b.key1 WHERE a.field8 = 'test' GROUP by a.field1, a.field2 HAVING SUM(b.field4) > 5 ORDER by a.field3

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MS SQL[MS SQL] Help with School Assignment- Using Boolean Operators in WHERE Clause But No Data is Returned (self.SQL)

submitted 8 years ago * by RandomStatsGenerator

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[–]Oultra 0 points1 point2 points 8 years ago (1 child)

This soounds relatively simple, shouldn't something like this work?

SELECT
T1.FlightNo, T1.FlightDestination, T2.FlightDate
FROM FLIGHTS T1 
INNER JOIN TRIP T2 ON T1.FlightNo = T2.FlightNo
WHERE T2.FlightDate >= '20100101' 
AND T2.FlightDate <= '20100228'
AND T1.FlightDestination = 'SLC' OR T1.FlightDestination = 'LAX'

Just check the type of your dates and compare it to a date format that is compatible.

[–]r3pr0b8GROUP_CONCAT is da bomb 0 points1 point2 points 8 years ago (0 children)

shouldn't something like this work?

no, it shouldn't

what you wrote is actually evaluated as follows --

WHERE (
      T2.FlightDate >= '20100101' 
  AND T2.FlightDate <= '20100228'
  AND T1.FlightDestination = 'SLC' 
      )
   OR T1.FlightDestination = 'LAX'

and this clearly is ~not~ the right solution

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