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I want to remove records length equal to two. Is there any direct query to remove those records? Reading raw by raw and delete take huge time. Because my database contain more than 4 million records.
ID Column1
1 abcde bgrft
2 ab
3 bgtyk
4 gh
I want to delete record 2 and 4. Because that size=2.
I'm assuming that by 'size' you mean string length
delete from mytable where length(Column1) = 2
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Let's say i have a table Task_status like below:
id TaskId SubTaskId status
1 1 1 Complete
2 1 2 Complete
3 1 3 Complete
4 2 4 InProgress
5 2 5 Complete
I want to find all the taskId whose all child tasks are Complete. How can I write that query?
Use group by and having to check if the number of rows per task equal the number of rows with Complete status.
select taskId
from tbl
group by taskId
having count(*) = sum(status='Complete')
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I have a table as follows:
name week effort
quentin 1 1
quentin 1 2
quentin 2 1
tracy 1 1
joe 2 2
There will only be a handful of unique names so it doesn't need to be dynamic
And I would like to query it to return something like
week QuentinEffortSum TracyEffortSum JoeEffortSum
1 3 1 0
2 1 0 2
I have tried something along the lines of
SELECT SUM(Effort) AS JoeEffort, Min (Week) AS week FROM [Group$]
WHERE name = "Joe"
GROUP BY week
ORDER By week
which returned:
week JoeEffort
1 3
2 1
and now I need the other columns and imagine in involves joins but am not sure how to complete the task
Please help
Thanks
I think a PIVOT table would work, like so:
SELECT *
FROM (
SELECT
week,name,effort
FROM [Group$]
) as s
PIVOT
(
SUM(effort)
FOR [name] IN ('quentin','joe','tracy')
)AS pvt
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From following 2 columns
I want to select minimum value for each 'sid'.
Output be like
S102 | 27800.00,
S101 | 90000.50,
S103 | 250000.00,
S104 | 15000.00,
S105 | 7500.75
Use group by:
select sid, min(o_amt) from orders group by sid
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Unfortunately My tables will be poor and I have no idea how to fix that. Essentially I have this table and I want to sum all the values on the right based on one value on the left. This is sample data but it will be 400+ records in the database. So if the numbers on the left are IDs for customers, and the numbers on the right are products purchased, how do I get a summary of products purchased per customer?
1 4
1 2
2 3
3 2
2 4
1 1
3 2
1 3
The final result would need to look like this:
1 10
2 7
3 4
SELECT
user_table.userID,
SUM(user_table.prodcut_purchase)
FROM
user_table
GROUP BY
user_table.userID
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I have this table with 2 columns of interest: ID, Memo_No plus some other columns.
ID is primary key of int type and auto-increment. Memo_No. is also int.
I need query, such that if memo no. is occuring only once in the table, the ID associated with it have to be selected.Plus, if same Memo has two different ID's, ID which is greater has to be selected.
For example i have table like this:
ID || Memo_No
1 2
2 3
3 4
4 5
5 4
6 6
7 2
From above table, I want to select rows whose ID's are 2,4,5,6,7 .
Thanks.
This is quite easy as an aggregation:
select max(id), memo_no
from t
group by memo_no;