I have a table with 2 columns and I want to get the columns that when the difference is made, the answer is greater than 500
Like this:
colOne - colTow
Can I do something like this is laravel eloquent
return $query->where('colOne','-','colTow','>=500')->get();
You can do this in two ways:
->whereRaw('colOne - colTow >= ?',[500])
or
->where(Db::raw('colOne - colTow') , '>=' ,500)
Read this: Raw Expressions.
Related
I have the following query:
SELECT
(sign(mr.p1_h2h_win_one_time - mr.p2_h2h_win_one_time)) AS h2h_win_one_time_1,
(abs(mr.p1_h2h_win_one_time - mr.p2_h2h_win_one_time) ^ 2) AS h2h_win_one_time_2
FROM belgarath.match_result AS mr
LIMIT 10
Which returns:
However, when I try to multiply the two fields:
SELECT
(
sign(mr.p1_h2h_win_one_time - mr.p2_h2h_win_one_time)
) *
(
abs(mr.p1_h2h_win_one_time - mr.p2_h2h_win_one_time) ^ 2
) AS h2h_win_one_time_comb
FROM belgarath.match_result AS mr
LIMIT 10
Workbench simply returns OK instead of any rows.
Doing some investigation I can get the first two rows to display if I use LIMIT 2. Looking at the returned values above I guess there must be some issue with multiplying the minus values or zero values from rows 3-10. However, this can be done simply on a calculator so what am I missing?
Maybe you think that the operator ^ is the power operator when in fact it is the Bitwise XOR operator.
MySql has the function pow() for your case:
pow(abs(mr.p1_h2h_win_one_time - mr.p2_h2h_win_one_time), 2)
I've got some troubles about SQL request :
I have a table like this table data image
I would like to create a view from this table to get :
Time_A : SUM of a column (total_time_taken) WHERE column (is_radiant)=1
Time_B : SUM of the same column (total_time_taken) WHERE column (is_radiant)=0
Time_AB : SUM of the column (total_time_taken) WHERE column (is_radiant)=0 OR (is_radiant)=1
SELECT
SUM(`matchpickban_radiant`.`total_time_taken`) AS `draft_time_radiant`,
SUM(`matchpickban_dire`.`total_time_taken`) AS `draft_time_radiant`
FROM
(`matchpickban` AS `matchpickban_radiant`
JOIN `matchpickban` AS `matchpickban_dire` ON ((`matchpickban_dire`.`idmatchpickban` = `matchpickban_radiant`.`idmatchpickban`)))
WHERE
`matchpickban_radiant`.`is_radiant` = 1
AND `matchpickban_dire`.`is_radiant` = 0
Actually I can run this request without syntax error but the result is NULL cause no data can be equal to 0 AND equal to 1 in the same time, obviously...
Also, I don't know if it's possible to make a JOIN the table to itself as I did (matchpickban JOIN matchpickban).
If syntax is correct I need to place my WHERE CONDITION away but don't know how, is it possible to replace it with 2 IF statement (IF is_radiant=0 SUM(...))
Thx for reading and helping me about this issue I got !
If you need more info about table or request I will give you all you need !
No need for a self-join or complex logic, you can just use conditional aggregation, which consists in using conditional expression within aggregate functions.
In MySQL, you could go:
select
sum(is_radiant * total_time_taken) time_a,
sum((1 - is_radiant) * total_time_taken) time_b,
sum(total_time_taken) time_ab
from matchpickban
where is_radiant in (0, 1)
This works because is_radiant is made of 0/1 values only - so this simplifies the logic. A more canonical way to phrase the conditional sums would be:
sum(case when is_radiant = 1 then total_time_taken else 0 end) time_a,
sum(case when is_radiant = 0 then total_time_taken else 0 end) time_b,
I have a table like these
date - name - val
16/02 - Rossi - 5
16/02 - Zingaro - 8
18/02 - Beniamino - 4
18/02 - Bosso - 2
Is possible with a query to get result like this?
16/02
Rossi - 5
Zingaro - 8
18/02
Beniamino - 4
Bosso - 2
Or I must do the query and then work with if/else ?
Simple select query can be like
select name,val froom table where date=&date
so with this you will get all the record with name & val for particular date.
Now question is no one is going to write query for each date.
So simply you can fetch all distinct date from your table with query
select DISTINCT date from table name
Now what remains is that you need to write a procedure which will have a loop and will take output of ditinct date as iterator and for each iteration fire select query for name & val.
For example, I have those data:
username,credits
user1,20
user2,30
user3,20
user4,20
user5,10
user6,30
...
they may have many many rows.(let's say 1000 )
but the credits group is limit.( let's say no more than 10)
How to make a group by query and pick up few data from each group? eg: 3 for each credit, the result is expected as bellow:
user5,10
userX,10
userY,10
user1,20
user3,20
user4,20
user2,30
user6,30
userZ,30
...
How to do that?
I have a MySQL table which looks like this:
id load_transit load_standby
1 40 20
2 30 15
3 50 10
I need to do the following calculations:
load_transit_mean = (40+30+50)/3 = 40
load_standby_mean = (20+15+10)/3 = 15
total_mean = (40+15)/2 = 27.5
Is it possible to do this in a single query? What would the best design be?
I need my answer to be scalable (the real design has more rows and columns), and able to handle some rows containing NULL.
I believe this would do it:
SELECT AVG(Load_transit)
, AVG(load_standby)
, (AVG(Load_transit) + AVG(load_standby))/2.0
FROM table
The AVG() function handles NULL's in that it ignores them, if you want the NULL row to be counted in your denominator you can replace AVG() with SUM() over COUNT(*), ie:
SUM(load_transit)/COUNT(*)
Regarding scalability, manually listing them out like above is probably the simplest solution.