Question

I’ve written this function before but I can’t seem to remember it and it didn’t get into version control. Now, more to do with sleep deprivation than anything else, I can’t remember how to rebuild it.

Here’s the idea. I have two tables, ‘regPrice’ and ‘custPrice’, with shared key ‘itemID.’ They both have a ‘price’ column and custPrice also has another key ‘acct’ such that if a price exists in custPrice, it should return that one. If there isn’t a custPrice entry, it should return the regPrice.

pseudoCode:

if(select custPrice where acct = passedAcct and itemID = passedItemID) {    return custPrice; else     return regPrice; 

Any help would be appreciated.

Answer 1

SELECT COALESCE(c.price, r.price) AS price FROM regPrice r LEFT OUTER JOIN custPrice c  ON (r.itemID = c.itemID AND c.acct = ?) WHERE r.itemID = ?;