I have a problem when I try to run this script I get the above error message. I am a rookie my level is beginner I am just trying to teach myself. What
This is my script
Select *
from Customer, Account where customerid=8;
This is my relation
You customer and account both have customerid field
You need specify what table are you refering too
Select *
from Customer, Account
where Customer.customerid=8;
Because customerid appears in both tables you have to tell SQL which table you want to use, e.g.
Select *
from Customer, Account where Customer.customerid = 8
or
Select *
from Customer, Account where Account.customerid = 8
Related
I have the following tables and I would like to find the company which has the most workers. I am fairly new to sql and I would like some help on constructing the query. Any briefing would be appreciated on which keywords to use or how to begin with writing the query. I would like to
“Find the company that has the most workers.”
worker(worker_name, city, street)
work for(worker_name, company_name, salary)
company(company_name, city)
manages( worker_name, manage_name)
this will get you the company with the most employees in it.
select top 1 company_name,
count(*) as nbr_of_employees
from work-for
group by company_name
order by 2 desc
For more detailed answer please add sample data to your question and expected result.
how it works:
the group by company_name will group all records with the same company_name togheter. Because of that the count(*) will give you the number of records in work-for for each group. (thus all workers for each company)
the order by 2 desc will make sure that the company-name with the most employees is on top of the lists
Finally, the top 1 in the select will only return the first record in that list
I have been searching all day but could not find answer to this:
I have a table on SQL Server:
dbo.Program
with fields:
Program.id...PK autoincrement
Program.user...varchar
Program.program...varchar
Program.installed...boolean
Program.department...varchar
Program.wheninstalled...date
Now, I want to insert a new record for every distinct user and copy the department from his latest(Program.wheninstalled) record with other values the same for every user:
Program.user...every unique user
Program.program...MyMostAwesomeProgram
Program.installed...false
Program.department...department of the record with the latest program.wheninstalled field of all the records of the unique user in program.user
Program.wheninstalled...null
I know how to do it in an ugly way:
select the latest records for every user and their department in that record
extract values from 1) and make it into insert into
(field1, field2...fieldX) values
(1records_value1, 1records_value2...1records_valueX),
(2records_value1, 2records_value2...2records_valueX),
...
(Nrecords_value1, Nrecords_value2...Nrecords_valueX)
but I would like to know how to do it in a better way. Oh I cannot use some proper HR databse to make my life easier so this is what I got to work with now.
I'm a postgres guy, but something akin to the below should work:
insert into Program (user, program, installed, department, wheninstalled)
select user,
'MyMostAwesomeProgram',
false,
(select department from someTable where u.user = ...),
null
from users as u;
from https://stackoverflow.com/a/23905173/3430807
you said you know how to do the select
insert into Program (user, program, installed, department, wheninstalled)
select user, 'MyMostAwesomeProgram', 'false' , department, null
from ...
This should do it:
insert into Program (user, program, installed, department, whenInstalled)
select user, program, installed, department, whenInstalled
from
(
select User
, 'MyMostAwesomeProgram' program
, 0 installed
, department
, null whenInstalled
, row_number() over (partition by user order by whenInstalled desc, id desc) r
from Program
) p
where p.r = 1
The interesting bit is the row_number() over (partition by user order by whenInstalled desc, id desc) r.
This says to return a column, r, which holds values 1..n for each user, counting up according to the order by clause (i.e. starting with the most recent whenInstalled and working backwards).
I also included the id field in the order by clause in case there were two installs for the same user on the same date; in such a case the most recently added (the one with the higher id is used first).
We then put this in a subquery, and select only the first record; thus we have 1 record per user, and it's the most recent.
The only values we use from this record are the user and department fields; all else is defined per your defaults.
So I am gonna answer this for some other people who might google this:
To get a records from a table to another table you need to use Select into statement
I like using With XXX as ( some select) to specify, say, "virtual" table with which you can work during the query
As JohnLBevan meantioned a very useful function Row_number, over, partition by and what i missed is a rank
So once you read on these you should be able to understand how to do what I wanted to do.
I've searched for long time for getting last entered data in a table. But I got same answer.
SELECT TOP 1 CustomerName FROM Customers
ORDER BY CustomerID DESC;
My scenario is, how to get last data if that Customers table is having CustomerName column only? No other columns such as ID or createdDate I entered four names in following order.
James
Arun
Suresh
Bryen
Now I want to select last entered CustomerName, i.e., Bryen. How can I get it..?
If the table is not properly designed (IDENTITY, TIMESTAMP, identifier generated using SEQUENCE etc.), INSERT order is not kept by SQL Server. So, "last" record is meaningless without some criteria to use for ordering.
One possible workaround is if, by chance, records in this table are linked to some other table records (FKs, 1:1 or 1:n connection) and that table has a timestamp or something similar and you can deduct insertion order.
More details about "ordering without criteria" can be found here and here.
; with cte_new as (
select *,row_number() over(order by(select 1000)) as new from tablename
)
select * from cte_new where new=4
I am facing 1 prob in implementing business solution. Any help would be much appreciated.
There is 1 table with 3 columns.
Table Employee
(
Id, Name, Salary
)
Values -
(1,John,10000),
(2,Rey, 15000),
(3,John,20000)
Expected Output -
It should fetch only distinct employees and for duplicate records of employee, it should fetch sum of salary.
So, output should be like this -
(1,john,30000),
(2,Rey,15000)
Please help
Check the basic sintaxis for GROUP BY
SELECT MIN(ID), Name, SUM(Salary)
FROM Employee
GROUP BY Name
The interesting part here is aggregation functions doesnt need to be at the end. As are usually show in the examples
I'm sorry, I'm newbie using T-SQL AND I would like to know how can i get value that doesn't occurs more than once. I already tried this but it didn't work.
SELECT DISTINCT *
FROM Orders
WHERE PmtType NOT IN ('VISA','DISC','FUNDING','DEALER CHECK','MC'
,'AMEX','BONUS POOL','DLR CK - NET30'
,'WIRE','MO','EXCHANGE','ONLINE','NULL')
AND OrderDate BETWEEN '2014-03-01 00:00:00'
and '2015-03-01 00:00:00'
AND CompanyId IN ('1311','8390','8394','8396','8397','8399','3966',
'8407','8408','8315','8411','8413','8414','8416'
,'8419','4850','8426','8428','8429','8430')
What I'm trying to get is this. Companies that receive Free Demos. Which the PmtType would be free, but never purchased a product.
If the customer never purchase a product the customer Id shouldn't appear in the
PmtType IN ('VISA','DISC','FUNDING','DEALER CHECK'
,'MC' ,'AMEX','BONUS POOL','DLR CK - NET30'
,'WIRE','MO','EXCHANGE','ONLINE','NULL')
if i read the question correctly you want to know which IDs have only 1 order, this will do it. I used generic field name as you didnt specify what "value" you want to find...
EDIT: added the NOT EXISTS clause after OP Comment, you may no longer need the group by, that is up to you...
SELECT CompanyId --add fields here as needed.
,Count(*) [Occurences]
FROM Orders o
WHERE PmtType = 'FREE'
AND NOT EXISTS (SELECT CompanyId
FROM Orders io
WHERE o.CompanyId = io.CompanyId
AND PmtType <> 'FREE' )
GROUP BY CompanyId --add fields here as needed.
HAVING Count(*) = 1 --leave this out to see how many free demos each company got.