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How can I select just some rows in the following table so that they sum up to certain value?
Table
-----
id | qty1 | qty2 | qty3 | qty4
------------------------------
1 | 0.0 | 0.0 | 10 | 20
2 | 1.5 | 0.0 | 7.5 | 18
3 | 1.0 | 2.0 | 7.5 | 18
4 | 0.0 | 0.5 | 5 | 13
Let's say, the top value I want is 57...
So I need to select the rows from the previous table such that qty1+qty2+qty3+qty4 of each row, get until that 57 value, and discard the other rows. In this example, I would get the following:
id | qty1 | qty2 | qty3 | qty4
------------------------------
1 | 0.0 | 0.0 | 10 | 20
2 | 1.5 | 0.0 | 7.5 | 18
Because 10+20+1.5+7.5+18 = 57, so I discard rows 3 & 4...
Now I wish that the top value is 50, then I should get:
id | qty1 | qty2 | qty3 | qty4
------------------------------
1 | 0.0 | 0.0 | 10 | 20
2 | 1.5 | 0.0 | 7.5 | 11
Since these values sum up to 50, and the 7 from row2,qty4 is left out... (BTW the rows are ordered in this particular way because that's the order in which I wish to account for the sums of qtys... It's not valid to sum up first row1, then 3, then 2 then 4, for example... They should always be sumed in the order 1,2,3,4...)
What if I would like the complement of this? I mean, the other two rows I didn't got in the last result.
First case:
id | qty1 | qty2 | qty3 | qty4
------------------------------
3 | 1.0 | 2.0 | 7.5 | 18
4 | 0.0 | 0.5 | 5 | 13
Second case:
id | qty1 | qty2 | qty3 | qty4
------------------------------
2 | 0.0 | 0.0 | 0.0 | 7
3 | 1.0 | 2.0 | 7.5 | 18
4 | 0.0 | 0.5 | 5 | 13
(If the second case is too complicated, how about obtaining:
id | qty1 | qty2 | qty3 | qty4
------------------------------
1 | 0.0 | 0.0 | 10 | 20
Because adding up the original qtys of row 2 would surpass the 50 value, I discard it... The complement in this case should just be:
id | qty1 | qty2 | qty3 | qty4
------------------------------
2 | 1.5 | 0.0 | 7.5 | 18
3 | 1.0 | 2.0 | 7.5 | 18
4 | 0.0 | 0.5 | 5 | 13
)
757
The simplified option in parentheses is not too bad:
SELECT foo1.*
FROM foo AS foo1
JOIN foo AS foo2
ON foo2.id <= foo1.id
GROUP
BY foo1.id
HAVING SUM(foo2.qty1 + foo2.qty2 + foo2.qty3 + foo2.qty4) <= 57
;
(You didn't mention the table's name, so I went with foo.)
The complement would be:
SELECT *
FROM foo
WHERE id NOT IN
( SELECT foo1.id
FROM foo AS foo1
JOIN foo AS foo2
ON foo2.id <= foo1.id
GROUP
BY foo1.id
HAVING SUM(foo2.qty1 + foo2.qty2 + foo2.qty3 + foo2.qty4) <= 57
)
;
The unparenthesized option is much trickier; it's doable, but you'd be much better off using a stored procedure.
141
Let's put it this way: If SQL was a religion I'd go to hell for providing this solution. SQL is not meant to solve this kind of problems, so any solution would be horrible. Mine is no exception :)
set @limitValue := 50;
select id, newQty1, newQty2, newQty3, newQty4 from (
select id,
if(@limitValue - qty1 > 0, qty1, greatest(@limitValue, 0)) newQty1,
@limitValue := @limitValue - qty1 Total1,
if(@limitValue - qty2 > 0, qty2, greatest(@limitValue, 0)) newQty2,
@limitValue := @limitValue - qty2 Total2,
if(@limitValue - qty3 > 0, qty3, greatest(@limitValue, 0)) newQty3,
@limitValue := @limitValue - qty3 Total3,
if(@limitValue - qty4 > 0, qty4, greatest(@limitValue, 0)) newQty4,
@limitValue := @limitValue - qty4 Total4
from (
select id, qty1, qty2, qty3, qty4,
@rowTotal < @limitValue Useful,
@previousRowTotal := @rowTotal PreviousRowTotal,
@rowTotal := @rowTotal + qty1 + qty2 + qty3 + qty4 AllRowsTotal,
@rowTotal - @previousRowTotal CurrentRowTotal
from t,
(select @rowTotal := 0, @previousRowTotal := 0) S1
) MarkedUseful
where useful = 1
) Final
For the provided data, this results in:
+----+---------+---------+---------+---------+
| ID | NEWQTY1 | NEWQTY2 | NEWQTY3 | NEWQTY4 |
+----+---------+---------+---------+---------+
| 1 | 0 | 0 | 10 | 20 |
| 2 | 1.5 | 0 | 7.5 | 11 |
+----+---------+---------+---------+---------+
And the complement:
set @limitValue := 50;
select t1.id,
coalesce(t1.qty1 - newQty1, t1.qty1) newQty1,
coalesce(t1.qty2 - newQty2, t1.qty2) newQty2,
coalesce(t1.qty3 - newQty3, t1.qty3) newQty3,
coalesce(t1.qty4 - newQty4, t1.qty4) newQty4
from t t1 left join (
select id,
if(@limitValue - qty1 > 0, qty1, greatest(@limitValue, 0)) newQty1,
@limitValue := @limitValue - qty1 Total1,
if(@limitValue - qty2 > 0, qty2, greatest(@limitValue, 0)) newQty2,
@limitValue := @limitValue - qty2 Total2,
if(@limitValue - qty3 > 0, qty3, greatest(@limitValue, 0)) newQty3,
@limitValue := @limitValue - qty3 Total3,
if(@limitValue - qty4 > 0, qty4, greatest(@limitValue, 0)) newQty4,
@limitValue := @limitValue - qty4 Total4
from (
select id, qty1, qty2, qty3, qty4,
@rowTotal < @limitValue Useful,
@previousRowTotal := @rowTotal PreviousRowTotal,
@rowTotal := @rowTotal + qty1 + qty2 + qty3 + qty4 AllRowsTotal,
@rowTotal - @previousRowTotal CurrentRowTotal
from t,
(select @rowTotal := 0, @previousRowTotal := 0) S1
) MarkedUseful
where useful = 1
) Final
on t1.id = final.id
where Total1 < 0 or Total2 < 0 or Total3 < 0 or Total4 < 0 or final.id is null
For the provided data, this results in:
+----+---------+---------+---------+---------+
| ID | NEWQTY1 | NEWQTY2 | NEWQTY3 | NEWQTY4 |
+----+---------+---------+---------+---------+
| 2 | 0 | 0 | 0 | 7 |
| 3 | 1 | 2 | 7.5 | 18 |
| 4 | 0 | 0.5 | 5 | 13 |
+----+---------+---------+---------+---------+
Enjoy!
30
You should adjust only the @limit variable initialization in the init subquery. The first query outputs data up to limit, the secnd query outputs its complement.
SELECT
id,
@qty1 as qty1,
@qty2 as qty2,
@qty3 as qty3,
@qty4 as qty4
FROM quantities q,
(SELECT @qty1:=0.0, @qty2:=0.0,
@qty3:=0.0, @qty4:=0.0,
@limit:=50.0) init
WHERE
IF(@limit > 0,
GREATEST(1,
IF(@limit-qty1 >=0,
@limit:=(@limit-(@qty1:=qty1)),
@qty1:=@limit + LEAST(@limit, @limit:=0)),
IF(@limit-qty2 >=0,
@limit:=(@limit-(@qty2:=qty2)),
@qty2:=@limit + LEAST(@limit, @limit:=0)),
IF(@limit-qty3 >=0,
@limit:=(@limit-(@qty3:=qty3)),
@qty3:=@limit + LEAST(@limit, @limit:=0)),
IF(@limit-qty4 >=0,
@limit:=(@limit-(@qty4:=qty4)),
@qty4:=@limit + LEAST(@limit, @limit:=0))),0)
;
The complement:
SELECT
id,
IF(qty1=@qty1, qty1, qty1-@qty1) as qty1,
IF(qty2=@qty2, qty2, qty2-@qty2) as qty2,
IF(qty3=@qty3, qty3, qty3-@qty3) as qty3,
IF(qty4=@qty4, qty4, qty4-@qty4) as qty4
FROM quantities q,
(SELECT @qty1:=0.0, @qty2:=0.0,
@qty3:=0.0, @qty4:=0.0,
@limit:=50.0) init
WHERE
IF(
LEAST(
IF(@limit-qty1 >=0,
@limit:=(@limit-(@qty1:=qty1)),
@qty1:=@limit + LEAST(@limit, @limit:=0)),
IF(@limit-qty2 >=0,
@limit:=(@limit-(@qty2:=qty2)),
@qty2:=@limit + LEAST(@limit, @limit:=0)),
IF(@limit-qty3 >=0,
@limit:=(@limit-(@qty3:=qty3)),
@qty3:=@limit + LEAST(@limit, @limit:=0)),
IF(@limit-qty4 >=0,
@limit:=(@limit-(@qty4:=qty4)),
@qty4:=@limit + LEAST(@limit, @limit:=0)),
@limit), 0, 1)
;
Let's load your sample data from the question
mysql> drop database if exists javier;
Query OK, 1 row affected (0.02 sec)
mysql> create database javier;
Query OK, 1 row affected (0.01 sec)
mysql> use javier
Database changed
mysql> create table mytable
-> (
-> id int not null auto_increment,
-> qty1 float,qty2 float,qty3 float,qty4 float,
-> primary key (id)
-> );
Query OK, 0 rows affected (0.08 sec)
mysql> insert into mytable (qty1,qty2,qty3,qty4) values
-> ( 0.0 , 0.0 , 10 , 20 ),( 1.5 , 0.0 , 7.5 , 18 ),
-> ( 1.0 , 2.0 , 7.5 , 18 ),( 0.0 , 0.5 , 5 , 13 );
Query OK, 4 rows affected (0.05 sec)
Records: 4 Duplicates: 0 Warnings: 0
mysql> select * from mytable;
+----+------+------+------+------+
| id | qty1 | qty2 | qty3 | qty4 |
+----+------+------+------+------+
| 1 | 0 | 0 | 10 | 20 |
| 2 | 1.5 | 0 | 7.5 | 18 |
| 3 | 1 | 2 | 7.5 | 18 |
| 4 | 0 | 0.5 | 5 | 13 |
+----+------+------+------+------+
4 rows in set (0.00 sec)
mysql>
select BBBB.* from (select id,sums FROM (select A.id,A.sums from
(select id,(select sum(qty1+qty2+qty3+qty4) from mytable BB
where BB.id<=AA.id) sums from mytable AA order by id) A
INNER JOIN (SELECT 50 mylimit) B ON A.sums <= B.mylimit) AAA
UNION
(select A.id,A.sums from (select id,(select sum(qty1+qty2+qty3+qty4)
from mytable BB where BB.id<=AA.id) sums from mytable AA order by id) A
where A.sums=(select min(A.sums) sums from (select id,
(select sum(qty1+qty2+qty3+qty4) from mytable BB where BB.id<=AA.id) sums
from mytable AA order by id) A INNER JOIN (SELECT 50 mylimit) B
ON A.sums >= B.mylimit))) AAAA JOIN mytable BBBB USING (id);
select BBBB.* from mytable BBBB LEFT JOIN
(select id,sums FROM (select A.id,A.sums from (
select id,(select sum(qty1+qty2+qty3+qty4)
from mytable BB where BB.id<=AA.id) sums
from mytable AA order by id) A INNER JOIN
(SELECT 50 mylimit) B ON A.sums <= B.mylimit) AAA
UNION
(select A.id,A.sums from (select id,
(select sum(qty1+qty2+qty3+qty4) from mytable BB
where BB.id<=AA.id) sums from mytable AA order by id) A
where A.sums=(select min(A.sums) sums from (
select id,(select sum(qty1+qty2+qty3+qty4) from mytable BB
where BB.id<=AA.id) sums from mytable AA order by id) A
INNER JOIN (SELECT 50 mylimit) B ON A.sums >= B.mylimit))) AAAA
USING (id) WHERE AAAA.id IS NULL;
Here is the output for 57
mysql> select BBBB.* from (select id,sums FROM (select A.id,A.sums from
-> (select id,(select sum(qty1+qty2+qty3+qty4) from mytable BB
-> where BB.id<=AA.id) sums from mytable AA order by id) A
-> INNER JOIN (SELECT 57 mylimit) B ON A.sums <= B.mylimit) AAA
-> UNION
-> (select A.id,A.sums from (select id,(select sum(qty1+qty2+qty3+qty4)
-> from mytable BB where BB.id<=AA.id) sums from mytable AA order by id) A
-> where A.sums=(select min(A.sums) sums from (select id,
-> (select sum(qty1+qty2+qty3+qty4) from mytable BB where BB.id<=AA.id) sums
-> from mytable AA order by id) A INNER JOIN (SELECT 57 mylimit) B
-> ON A.sums >= B.mylimit))) AAAA JOIN mytable BBBB USING (id);
+----+------+------+------+------+
| id | qty1 | qty2 | qty3 | qty4 |
+----+------+------+------+------+
| 1 | 0 | 0 | 10 | 20 |
| 2 | 1.5 | 0 | 7.5 | 18 |
+----+------+------+------+------+
2 rows in set (0.00 sec)
mysql> select BBBB.* from mytable BBBB LEFT JOIN
-> (select id,sums FROM (select A.id,A.sums from (
-> select id,(select sum(qty1+qty2+qty3+qty4)
-> from mytable BB where BB.id<=AA.id) sums
-> from mytable AA order by id) A INNER JOIN
-> (SELECT 57 mylimit) B ON A.sums <= B.mylimit) AAA
-> UNION
-> (select A.id,A.sums from (select id,
-> (select sum(qty1+qty2+qty3+qty4) from mytable BB
-> where BB.id<=AA.id) sums from mytable AA order by id) A
-> where A.sums=(select min(A.sums) sums from (
-> select id,(select sum(qty1+qty2+qty3+qty4) from mytable BB
-> where BB.id<=AA.id) sums from mytable AA order by id) A
-> INNER JOIN (SELECT 57 mylimit) B ON A.sums >= B.mylimit))) AAAA
-> USING (id) WHERE AAAA.id IS NULL;
+----+------+------+------+------+
| id | qty1 | qty2 | qty3 | qty4 |
+----+------+------+------+------+
| 3 | 1 | 2 | 7.5 | 18 |
| 4 | 0 | 0.5 | 5 | 13 |
+----+------+------+------+------+
2 rows in set (0.00 sec)
mysql>
Here is the output for 50
mysql> select BBBB.* from (select id,sums FROM (select A.id,A.sums from
-> (select id,(select sum(qty1+qty2+qty3+qty4) from mytable BB
-> where BB.id<=AA.id) sums from mytable AA order by id) A
-> INNER JOIN (SELECT 50 mylimit) B ON A.sums <= B.mylimit) AAA
-> UNION
-> (select A.id,A.sums from (select id,(select sum(qty1+qty2+qty3+qty4)
-> from mytable BB where BB.id<=AA.id) sums from mytable AA order by id) A
-> where A.sums=(select min(A.sums) sums from (select id,
-> (select sum(qty1+qty2+qty3+qty4) from mytable BB where BB.id<=AA.id) sums
-> from mytable AA order by id) A INNER JOIN (SELECT 50 mylimit) B
-> ON A.sums >= B.mylimit))) AAAA JOIN mytable BBBB USING (id);
+----+------+------+------+------+
| id | qty1 | qty2 | qty3 | qty4 |
+----+------+------+------+------+
| 1 | 0 | 0 | 10 | 20 |
| 2 | 1.5 | 0 | 7.5 | 18 |
+----+------+------+------+------+
2 rows in set (0.00 sec)
mysql> select BBBB.* from mytable BBBB LEFT JOIN
-> (select id,sums FROM (select A.id,A.sums from (
-> select id,(select sum(qty1+qty2+qty3+qty4)
-> from mytable BB where BB.id<=AA.id) sums
-> from mytable AA order by id) A INNER JOIN
-> (SELECT 50 mylimit) B ON A.sums <= B.mylimit) AAA
-> UNION
-> (select A.id,A.sums from (select id,
-> (select sum(qty1+qty2+qty3+qty4) from mytable BB
-> where BB.id<=AA.id) sums from mytable AA order by id) A
-> where A.sums=(select min(A.sums) sums from (
-> select id,(select sum(qty1+qty2+qty3+qty4) from mytable BB
-> where BB.id<=AA.id) sums from mytable AA order by id) A
-> INNER JOIN (SELECT 50 mylimit) B ON A.sums >= B.mylimit))) AAAA
-> USING (id) WHERE AAAA.id IS NULL;
+----+------+------+------+------+
| id | qty1 | qty2 | qty3 | qty4 |
+----+------+------+------+------+
| 3 | 1 | 2 | 7.5 | 18 |
| 4 | 0 | 0.5 | 5 | 13 |
+----+------+------+------+------+
2 rows in set (0.01 sec)
mysql>
Please remember to set the number for mylimit in the (SELECT 50 mylimit) subquery twice each.
Please tell I got this one...
4
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