question

naveeda2000 avatar image
naveeda2000 asked

Need help to compare pricing using SQL queries

Thank you for help in advance.

I have 2 sets of data that show bus journeys and there relevant price from 2 different systems that i need to compare.

Table1
-Brand
-Origin
-Destination
-Price

Table2
-Brand
-Origin
-Destination
-Price

So what i need todo is to match all the following fields and return the price from table2 which i have done using the following:

SELECT
Table1.Brand
Table1.Origin
Table1.Destination
Table1.Price
Table2.Price
FROM Table1
LEFT JOIN Table2
ON
Table1.Brand = Table2.Brand
Table1.Origin = Table2.Origin
Table1.Destination = Table2.Destination

ResultTable:
Brand | Origin | Destination | Price | Table2.Price |

So upto now i have the correct data however i need to the following which i could really do with some help:

  1. Compare Table1.Price against Table2.Price and display the difference in the ResultTable above
  2. Filter out all prices that are the same so all we have left is the different prices
  3. A new query where we compare the Brand, Origin and Destination and if any are missing from table 2 we display those

Sorry for the long winded explanation but just thought i would try to make it as explicit as possible.

Thanks

selectjoinssql queryunion
10 |1200
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1 Answer

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Rickwaldorf avatar image
Rickwaldorf answered

Created a couple of tables and did a sql statement. Hope this helps.

work_table_t1

brand price

1 10

2 8

work_table_t2

brand price

2 8

select t1.brand,t1.price,t2.price, sum(t1.price-t2.price) as 'price diff' from work_table_t1 t1

left join work_table_t2 t2 on t2.brand = t1.brand

group by t1.brand,t1.price,t2.price

having sum(t1.price-t2.price) <>0

Results: only one record will show in results because of the "<> 0" clause

brand price price price diff

1 10 9 1

10 |1200
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