>One last thing: you set, at first, a parameter called @prev with Null
>(' ') value: right?
No, I set it to a string containing one space char. Use anything that
does not occur as data in the column.
>And, after, you use, instead IF ELSE statement, another syntax: is it
>trinary operator? if yes, why it not is in the online MySQL manual?
I used the IF() function, see 'Control Flow Functions' under 'Functions
and Operators' in the manual
PB
------
spacemarc wrote:
> 2007/5/2, Peter Brawley <peter.brawley@stripped>:
>> Right, give the computed column an alias differeing from the column
>> name, eg
>>
>> SET @prev='';
>> SELECT
>> IF(area = @prev, '', @prev := area) AS AreaHdr,
>> text,amount
>> FROM products
>> ORDER BY area DESC;
>
> ok, now it works! thanks!
>
> One last thing: you set, at first, a parameter called @prev with Null
> (' ') value: right?
>
> And, after, you use, instead IF ELSE statement, another syntax: is it
> trinary operator? if yes, why it not is in the online MySQL manual?
>
