Question

I have three tables as below.

tbl1

eid qnt   pb
12     3   1
13     1   1
23     3   1

tbl2

tid   eid  fx   so
1      12    0    1
2      13    0    1
3      23    1    1
4      23    0    1

tbl3

tlid   tid  eid  fx
1      1    12    0
2      1    12    0
3      2    13    0
4      3    23    1
5      4    23    0

Need an update query that counts the number of ‘tlid’ in ‘tbl3’

who’s ‘pb’ in ‘tb1’ is ‘1’

who’s ‘eid’ in ‘tbl2’ does not have ‘1’ as one if it’s ‘fx’

and update ‘so’ in ‘tbl2’ to ‘0’ if the total counted ‘tlid’ in ‘tbl3’ is ‘LESS’ than the ‘qnt’ in ‘tbl1’

The final result will be that ‘so’ for ‘tid 1’ in ‘tbl2’ will be ‘0’

The others will not get updated because:

The sum of ‘tlid’ in ‘tbl3’ for ‘tid 2’ or ‘eid 13’ in ‘tble3’ = ‘qnt’ in ‘tbl1’

and

‘tlid’ for ‘eid 23’ in ‘tbl3’ will not be counted becuse ‘eid 23’ has ‘1’ in one of the ‘fx’ in ‘tbl2’

Appreciate your help

drop table if exists tbl1;
create table tbl1 (eid integer, qnt integer, pb integer);
insert into tbl1 values (12,3,1),(13,1,1),(23,3,1);

drop table if exists tbl2;
create table tbl2 (tid integer, eid integer, fx integer, so integer);
insert into tbl2 values (1,12,0,1),(2,13,0,1),(3,23,1,1),(4,23,0,1);

drop table if exists tbl3;
create table tbl3 (tlid integer, tid integer, eid integer, fx integer);
insert into tbl3 values (1,1,12,0),(2,1,12,0),(3,2,13,0),(4,3,23,1),(5,4,23,0) ;

Answer 1

Try this:

UPDATE tbl2, 
       (SELECT * 
        FROM   (SELECT tbl1.eid, 
                       tbl1.qnt, 
                       tbl3.tid, 
                       COUNT(DISTINCT tlid) cnt 
                FROM   tbl1, 
                       tbl3, 
                       tbl2 
                WHERE  tbl1.eid = tbl3.eid 
                       AND tbl2.eid = tbl3.eid 
                       AND pb = 1 
                       AND tbl2.eid NOT IN (SELECT tbl2.eid 
                                            FROM   tbl2 
                                            WHERE  fx = 1) 
                GROUP  BY tbl1.eid, 
                          tbl3.tid, 
                          tbl1.qnt) a 
        WHERE  cnt < qnt) b 
SET    so = 0 
WHERE  tbl2.tid = b.tid