I have a log table with following schema:
OperatorId - JobId - Status ( Good/Bad/Ugly )
Alex 6 Good
Alex 7 Good
James 6 Bad
Description: Whenever an operator works on a job, an entry is made along with Status. That's it.
Now I need a report like:
OperatorId - Good Count - Bad Count - Ugly Count
Alex 2 0 0
James 0 1 0
select operatorid,
sum(if(status="good",1,0)) as good,
sum(if(status="bad",1,0)) as bad,
sum(if(status="ugly",1,0)) as ugly
from table
group by operatorid
This is called a Pivot Table. It is done by setting a value 1 or 0 for each state and then summing them up:
SELECT
T.OperatorId,
SUM(T.GoodStat) AS Good,
SUM(T.BadStat) AS Bad,
SUM(T.UglyStat) AS Ugly
FROM
(
SELECT
CASE WHEN Status = 'Good' THEN 1 ELSE 0 END AS GoodStat,
CASE WHEN Status = 'Bad' THEN 1 ELSE 0 END AS BadStat,
CASE WHEN Status = 'Ugly' THEN 1 ELSE 0 END AS UglyStat,
OperatorId
FROM logTable T
)
GROUP BY T.OperatorId
If, like me, you prefer, whenever possible, to calculate counts with COUNT rather than with SUM, here's an alternative solution, which uses a method asked about in this thread:
SELECT
operatorid,
COUNT(status = 'good' OR NULL) as good,
COUNT(status = 'bad' OR NULL) as bad,
COUNT(status = 'ugly' OR NULL) as ugly
FROM table
GROUP BY operatorid
Related
First of all I want to thank you all members of this community for posting very helpful answers. I am using this kind of plateform first so I am sorry for my grammatical mistakes and if it is a silly question.
I am having a use case as given in below image link.
Having two tables 1. is Office_1 and 2. is Office_2 and want the Desired Output
For this use case I am able to get Output separately only from one table using below query
First query is for one table (Office_1)
select EID as EID,sum(case when OP like 'come' then 1 else 0 end) as 'Office_1 Come COUNT',sum(case when OP like 'go' then 1 else 0 end) as 'Office_1 Go COUNT' from Office_1 where DATE >= '2022-01-16' AND DATE <= '2022-01-18' group by UID;
Second query is for another table (Office_2)
select EID as EID,sum(case when OP like 'come' then 1 else 0 end) as 'Office_2 Come COUNT',sum(case when OP like 'go' then 1 else 0 end) as 'Office_2 Go COUNT' from Office_2 where DATE >= '2022-01-16' AND DATE <= '2022-01-18' group by UID;
But I want that UID must be selected from first table and output must be combined to display. Please help me in this use case. How to get the desired output?
select* from(select EID as EID,sum(case when OP like 'come' then 1 else 0 end) as 'Office_1 Come COUNT',sum(case when OP like 'go' then 1 else 0 end) as 'Office_1 Go COUNT',date as dt from Office_1
union
select EID as EID,sum(case when OP like 'come' then 1 else 0 end) as 'Office_2 Come COUNT',sum(case when OP like 'go' then 1 else 0 end) as 'Office_2 Go COUNT',date as dt from Office_2)
where dt >= '2022-01-16' AND DATE <= '2022-01-18' group by UID;
Please refer here for more information about union select https://dev.mysql.com/doc/refman/8.0/en/union.html
Is there any way to find values that meet any m conditions out of given n conditions? For instance, if there are 10 conditions, and I want to find values that meet any 2 of them.
Use CASE expressions in the WHERE clause, 1 for each condition like this:
WHERE 2 =
CASE WHEN <condition1> THEN 1 ELSE 0 END +
CASE WHEN <condition2> THEN 1 ELSE 0 END +
CASE WHEN <condition3> THEN 1 ELSE 0 END +
..........................................
You can change the = sign to > or < to meet your requirement.
There is. It's not gonna be pretty though.
Start with your conditions as SELECT expressions.
select T.*,
case
when T.SOME_NUMERIC_COLUMN > 0 then 1
else 0
end IS_POSITIVE,
(select sign(COUNT(*))
from SOME_OTHER_TABLE
where parent_id = T.ID) HAS_CHILDREN
...
from SOME_TABLE T
Design these expression in such a way that you get 1 when a condition is met and 0 when it's not.
Then sum up the score and add a WHERE clause.
SELECT *
FROM (
SELECT R.*,
IS_POSITIVE + HAS_CHILDREN + ... SCORE
FROM (...) R)
WHERE SCORE > 2
Of course you're gonna pay a hefty price in performance for this. You won't be able to use your conditions directly to limit the resultset so I'd expect the execution plans to be extremely disappointing. That said, it's not like what you have in mind is a standard task for RDBMS so it should be enough for a proof of concept.
I have a database with roughly 6 million entries - and will grow - where I'm running queries to return for a HighCharts charting functionality. I need to read longitudinally over years, so I'm running queries like this:
foreach($states as $state_id) { //php code
SELECT //mysql psuedocode
sum(case when mydatabase.Year = '2003' then 1 else 0 end) Year_2003,
sum(case when mydatabase.Year = '2004' then 1 else 0 end) Year_2004,
sum(case when mydatabase.Year = '2005' then 1 else 0 end) Year_2005,
sum(case when mydatabase.Year = '2006' then 1 else 0 end) Year_2006,
sum(case when mydatabase.Year = '2007' then 1 else 0 end) Year_2007,
sum(case when mydatabase.Year = '$more_years' then 1 else 0 end) Year_$whatever_year,
FROM mytable
WHERE State='$state_id'
AND Sex IN (0,1)
AND Age_segment IN (5,4,3,2,1)
AND "other_filters IN (etc, etc, etc)
} //end php code
But for various state at once... So returning lets say 5 states, each with the above statement but a state ID is substituted. Meanwhile the years can be any number of years, the Sex (male/female/other) and Age segment and other modifiers keep changing based on filters. The queries are long (at minimum 30-40seconds) a piece. So a thought I had - unless I'm totally doing it wrong - is to actually store the above query in a second table with the results, and first check that "meta query" and see if it was "cached" and then return the results without reading the db (which won't be updated very often).
Is this a good method or are there potential problems I'm not seeing?
EDIT: changed to table, not db (duh).
Table structure is:
id | Year | Sex | Age_segment | Another_filter | Etc
Nothing more complicated than that and no joining anything else. There are keys on id, Year, Sex, and Age_segment right now.
Proper indexing is what is needed to speed up the query. Start by doing an "EXPLAIN" on the query and post the results here.
I would suggest the following to start off. This way avoids the for loop and returns the data in 1 query. Not knowing the number of rows and cardinality of each column I suggest a composite index on State and Year.
SELECT mytable.State,mytable.Year,count(*)
FROM mytable
AND Sex IN (0,1)
AND Age_segment IN (5,4,3,2,1)
AND "other_filters IN (etc, etc, etc)
GROUP BY mytable.State,mytable.Year
The above query can be further optimised by checking the cardinality of some of the columns. Run the following to get the cardinality:
SELECT Age_segment FROM mytable GROUP BY Age_segment;
Pseudo code...
SELECT Year
, COUNT(*) total
FROM my_its_not_a_database_its_a_table
WHERE State = $state_id
AND Sex IN (0,1)
AND Age_segment IN (5,4,3,2,1)
GROUP
BY Year;
Scenario:
I have a column in a MySql table:
my_column - [INT] (Unsigned)
What I need:
I need a query to select ONE ENTRY with conditions as follows:
Given A=n
SELECT FIRST the one with my_column = n
ELSE (my_column = n null result)
SELECT the one with my_column = 0
ELSE
SELECT the one with my_column = whatever
ELSE
Return 0 entries
What I looked into:
I tried:
... WHEREmy_columnIN (n,0) ORDER BYmy_columnDESC LIMIT 1
Which applies for the first two steps, but not for the third one.
Thanks for reading.
Given your description, just use case:
order by (case when field = n then 1
when field = 0 then 2
else 3
end)
Then, of course, you would add limit 1.
Bit of a newbie and probably a very basic question to you, but is driving me mad.
I have a mysql table. I have a record which has a record id, and six other fields which contain names of photographs.
So,
Record_id, photo1, photo2, photo3, photo4, photo5, photo6
I want have have the end result where I have a column called 'TOTAL' which shows the number of how many records have photographs in them as a TOTAL. So, Record 1 may have a total of 5 photographs, record 2 may have 3 photographs, and record 3 may have a total of NO records for that record etc?
Now some of the photographs names which are uploaded to the field may contain numbers, ie, photo244.jpg, or pic3993.jpg etc - so I don't want these numbers added together, I am just looking for whether the field has a name in it etc, and this would be counted as 1 to add to the total. So the end result in on the page is that record 13 (for example) has a total of 4 photographs etc - sorry if not a good explanation!
It may have something to do with SUM or COUNT, but have spent ages trying to get combination or correct key/syntax! Can anyone help please by giving an example of the mysql select statement - would be grateful!
I presume that if there is no photo, then the field photoX is null or is empty.
So use CASE for output 0 if the field is null or empty, 1 else.
SELECT Record_id
,
CASE WHEN (photo1 IS NULL OR photo1 = '') THEN 0 ELSE 1 END
+ CASE WHEN (photo2 IS NULL OR photo2 = '') THEN 0 ELSE 1 END
+ CASE WHEN (photo3 IS NULL OR photo3 = '') THEN 0 ELSE 1 END
+ CASE WHEN (photo4 IS NULL OR photo4 = '') THEN 0 ELSE 1 END
+ CASE WHEN (photo5 IS NULL OR photo5 = '') THEN 0 ELSE 1 END
+ CASE WHEN (photo6 IS NULL OR photo6 = '') THEN 0 ELSE 1 END
AS Total
FROM myTable
It will the best query:
SELECT
Record_id,
(6 - IFNULL(photo1,1) - IFNULL(photo2,1) - IFNULL(photo3,1) - IFNULL(photo4,1) - IFNULL(photo5,1) - IFNULL(photo6,1)) AS TOTAL
FROM
table
Something like this will give you a count by Photo1, Photo2, etc.:
SELECT
SUM(CASE WHEN photo1 IS NOT NULL THEN 1 END) AS Photo1Count,
SUM(CASE WHEN photo2 IS NOT NULL THEN 1 END) AS Photo2Count,
SUM(CASE WHEN photo3 IS NOT NULL THEN 1 END) AS Photo3Count,
SUM(CASE WHEN photo4 IS NOT NULL THEN 1 END) AS Photo4Count,
SUM(CASE WHEN photo5 IS NOT NULL THEN 1 END) AS Photo5Count
FROM MyTable
Something like this will count how many rows have at least one photograph:
SELECT SUM (
CASE WHEN
photo1 IS NOT NULL OR
photo2 IS NOT NULL OR
photo3 IS NOT NULL OR
photo4 IS NOT NULL OR
photo5 IS NOT NULL THEN 1 END)
FROM MyTable
Note that these queries are for grand totals. They don't show activity by row. If activity by row is needed, try the answers from Scorpi0 or Michael Sivolobov.