I have data like
column
1
1
57
57
57
1
1
57
57
I need to generate count data like
count
2
3
2
2
using mysql query. I have tried group by but it groups all the values also i couldn't group by any other fields. Is there any easy way to achieve this?
find the screenshot in this link
Update:
My end goal is to get the time spend by the user on each course . like the user who has ID 1 have spend time from 1177924991 to 1177925038 ( here 1177925038 is one second minus the next course visit time) on course id 1
Use this query:
SELECT COUNT(*)
FROM `tablename`
GROUP BY `info`
try using
SELECT COUNT(columnname)
FROM `tablename`
GROUP BY columnname
This will do the needful.
UPDATE
I am getting following result set on running this query :
Use This Query:
Select `course`, count(*) from `tablename`
group by `course`
Related
here i have a table named as test2. i need to get the below output from a single mysql query.i have tried it using a subquery but i was fail. kindly help me to sort this.
pending status- 154
completed status - 159
required output
query that i have tried
SELECT
(
test2.doc_no,
SELECT
(
Count(test2.esn) AS pending_quantity,
test2.doc_no
FROM
test2
WHERE
test2.sttus = 154
GROUP BY
test2.doc_no
),
SELECT
(
Count(test2.esn) AS completed_quantity,
test2.doc_no
FROM
test2
WHERE
test2.sttus = 159
GROUP BY
test2.doc_no
)
)
SELECT doc_no,
SUM(STATUS=154) AS pending_quantity,
SUM(STATUS=159) AS completed_quantity
FROM
test2 GROUP BY doc_no
Try above query.
I have table like that,
id name count
1 rrr 2
2 www 3
3 qqq 4
4 aaa 5
5 gyhhh 4
6 dfgdfg 5
I want to write the query which find the name in table and if it find then increment the count in count column for that name. The count maintain the no of time name used by the user.If user used the name , then I am check the name in db , if it found then I want to update row with increment in count.
A simple update query required:
If you want to increase count only if the input parameter exactly matches the name then use this:
UPDATE your_table
SET `count` = `count` + 1
WHERE `name` = ?
And if you want to increase count if the input parameter is a substring of name then you can use LIKE
UPDATE your_table
SET `count` = `count` + 1
WHERE `name` LIKE CONCAT('%',?,'%')
Note: Replace the question mark (?) by your input parameter.
Try this:
select id,name, id + 1 from
(Select id,name from table_name where name in('sa','da','ba','ca')) as a;
hope it helps..
I have a table that stores a reference for each product-identifier, however there are some duplicate records - ie. a product may have been submitted more than once so has more than one reference. Each record is timestamped with the updated column.
I need a query that will only give one (non-empty) reference per product-identifier but that crucially will only select the LATEST record for each product.
So if the original table is this:
id updated product-identifier reference
------------------------------------------------------------
1 2014-11-10 07:47:02 9876543210123 98043hjdww98324322
2 2014-11-10 07:53:24 9897434243242 89f7e9wew329f080re
3 2014-11-12 10:51:10 9876543210123 48308402jfjewkfwek
4 2014-11-12 12:53:24 9876543210123 89739432bkjfekwjfk
5 2014-11-12 12:55:16 9876543210321 21321hhfioefhewfoe
6 2014-11-13 01:01:10 9897434243242
7 2014-11-13 01:05:24 9897434243242 1232423jhdksffewfe
The query should return just these records:
id updated product-identifier reference
------------------------------------------------------------
4 2014-11-12 12:53:24 9876543210123 89739432bkjfekwjfk
5 2014-11-12 12:55:16 9876543210321 21321hhfioefhewfoe
7 2014-11-13 01:05:24 9897434243242 1232423jhdksffewfe
I have tried
SELECT * FROM tablename WHERE reference !='' GROUP BY product-identifier ORDER BY updated DESC
and this gives only one record for each product, but not the latest - it is grouping before sorting.
Help greatly appreciated!
I usually do this by having a subquery that selects the highest timestamp for each group (product_identfier in your case) and then use that to select the row I want. Like this
select *
from tablename a
where a.updated = (select max(updated)
from tablename b
where a.product_identifier = b.product_identifier)
There are many ways to do this. If you want the latest record, here is a method using not exists:
select t.*
from tablename t
where not exists (select 1
from tablename t2
where t2.product_identifier = t.product_identifier and
t2.updated > t.updated
);
I thought I had a very simple query to perform, but I can't seem to make it work.
I have this table with 2 columns:
version_id trim_id
1 15
1 25
1 28
1 30
1 35
2 12
2 25
2 33
2 48
3 11
3 25
3 30
3 32
I am trying to get any version-id's that have say a sub-set of trim_id's. Let's say all version_id's that have trim_id's 25 and 30. My obvious attempt was :
SELECT * FROM table WHERE trim_id=25 AND trim_id=30
I was expecting to have version_id 1 and 3 as a result, but instead I get nothing.
I am working with the latest version of MAMP, which has some odd behavior, like in this case it just tells me its 'LOADING' and never gives me an error message or something. But that's normally the case when there is no data to return.
This is InnoDB, if that helps.
Thanks for your input.
Your query does not work because you are using AND and the trim_id cannot have two different values at the same time, so you need to apply Relational Division to get the result.
You will need to use something similar to the following:
SELECT version_id
FROM yourtable
WHERE trim_id in (25, 30)
group by version_id
having count(distinct trim_id) = 2
See SQL Fiddle with Demo.
This will return the version_id values that have both 25 and 30. Then if you wanted to include additional columns in the final result, you can expand the query to:
select t1.version_id, t1.trim_id
from yourtable t1
where exists (SELECT t2.version_id
FROM yourtable t2
WHERE t2.trim_id in (25, 30)
and t1.version_id = t2.version_id
group by t2.version_id
having count(distinct t2.trim_id) = 2);
See SQL Fiddle with Demo
SELECT *
FROM table
WHERE trim_id IN(25,30)
Got this:
Table a
ID RelatedBs
1 NULL
2 NULL
Table b
AID ID
1 1
1 2
1 3
2 4
2 5
2 6
Need Table a to have a comma separated list as given in table b. And then table b will become obsolete:
Table a
ID RelatedBs
1 1,2,3
2 4,5,6
This does not rund through all records, but just ad one 'b' to 'table a'
UPDATE a, b
SET relatedbs = CONCAT(relatedbs,',',b.id)
WHERE a.id = b.aid
UPDATE: Thanks, 3 correct answers (marked oldest as answer)! GROUP_CONCAT is the one to use. No need to insert commas between the ids using relatedids = CONCAT(relatedids,',',next_id) that is done automatic by GROUP_CONCAT.
You'll have to use the mysql group_concat function in order to achieve this: http://dev.mysql.com/doc/refman/5.1/en/group-by-functions.html#function_group-concat
Look into GROUP_CONCAT(expr)
mysql> SELECT student_name,
-> GROUP_CONCAT(DISTINCT test_score
-> ORDER BY test_score DESC SEPARATOR " ")
-> FROM student
-> GROUP BY student_name;
You can't do that in standard SQL. You could write a stored procedure to do that. I had a similar problem, but I was using PostgreSQL so I was able to resolve it by writing a custom aggregate function so that you can do queries like
select aid, concat(id)
from b group by
aid
Update: MySQL has a group_concat aggregate function so you can do something like
SELECT id,GROUP_CONCAT(client_id) FROM services WHERE id = 3 GROUP BY id
as outlined here.