Re: File full error in simple select statement
Posted by: Peter Brawley
Date: May 11, 2021 12:57PM

Before you get to spending money on this ...

1 the tmp table generated by your query has 23M rows, the table rowcounts are 350K and 800, ie there are 280M possible combinations so your join hits about 8% of all possible row combinations from the two tables, does that sound about right?

2 Let's see the actual result of ...

EXPLAIN select
  w.weekend,
  d2.code as family,
  sum(ifnull(d2.amount, 0)) as owing 
from weekendings w 
join dr02 d2 on (w.weekend >= d2.date and d2.t1 <> "g") 
             or (w.weekend >= d2.weekend and d2.t1 = "g")
group by w.weekend, d2.code;

... and of ...

EXPLAIN select weekend, family, sum(amount) as owing
from (
  select w.weekend, d2.code as family, d2.amount
  from weekendings w  
  join dr02        d2 on (w.weekend >= d2.date and d2.t1 <> "g") 
                      or (w.weekend >= d2.weekend and d2.t1 = "g")
  where d2.code = "smi1" and d2.amount is not null
) x
group by weekend, family
order by weekend, family;

3 What proportion of dr02.amount values are null?

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Re: File full error in simple select statement
May 11, 2021 12:57PM


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