Calculate sum of three columns (net sales, VAT, total sales

MySQL, MariaDB, sum, multiple columns

[davurs]

How can the following constructed example be acheived:

I have a small table named Sales (and another named Purchases - but never mind that now ;) )

---+----------+-----------+--------+
ID | ClientID | NetAmount | Date | 
---+----------+-----------+--------+
01 | 1000001 | 1987,50 | 010212 |
---+----------+-----------+--------+
02 | 1000002 | 934,75 | 020212 |
---+----------+-----------+--------+

I imagined I could then construct a query like:

select sum(NetAmount) as NetSale, format((NetSale/4),2) as VAT,(NetSale + VAT) as TotalSale 

referencing to other results within the query,

Can it be done? That example did not work, obviously.

[eelixduppy]

Perhaps something like this?

select 
 format((results.NetSale/4),2) VAT, 
 (results.NetSale*5/4) TotalSale 
from ( 
 select sum(NetAmount) NetSale from sales 
) results 

or you can just rewrite each result in terms of the sum:

select sum(NetAmount) as NetSale, format((sum(NetAmount)/4),2) as VAT,(sum(NetAmount)*5/4) as TotalSale  

However, something like this should really be put into a stored procedure.