I have two tables in a one to many relationship within an IBM DB2 database. I can't think of a way to describe what I'm doing in words easily so I'm linking an SQLFiddle.
Here is a working SQLFiddle on what I'm doing;
Click Here
The SQLFiddle works exactly like I need it to. My problem is, I am using an IBM DB2 database and the COUNT function does not seem to work. Does anyone have a way to return what the SQLFiddle does in a IBM DB2 compatible way?
Here is the error I get from i Navigator; Click Here
You are aggregating by the wrong column. I think this is the query you want:
SELECT Table1.quote, COUNT(Table2.quote) as TotalItem
FROM Table1 LEFT JOIN
Table2
ON Table1.quote = Table2.quote
GROUP BY Table1.quote
---------^
You need to aggregate by Table1.quote because Table2.quote might be NULL, because of the LEFT JOIN.
EDIT:
Your particular problem seems to be your having two tables with the same names. Just use column aliases:
SELECT t1.quote, COUNT(t2.quote) as TotalItem
FROM Table1 t1 LEFT JOIN
Table2 t2
ON t1.quote = t2.quote
GROUP BY t1.quote;
Related
In my queries, I have used the unix_date function to group and count the data from backlogs to specific date. All works very well.
..
SELECT
*,
FROM
table1
FULL OUTER JOIN table2 USING (ID)
I'm not sure what should I add for the joining part to get a right query. I skipped the details of query as the query is quite long to be put on this post. Please let me know if you need the full query.
Problem: I think the join table append the row instead of just adding the column from joined query results because there are many same IDs in all tables (many-many relationship problem).However, not sure how to solve it.
Solved using composite key.
..
SELECT
*,
FROM
table1
FULL OUTER JOIN table2 USING (ID, Date)
I want to do self-join I have written a code as well but its throwing an error and it seems that there is some issue with an alias.
Apart from this it would also be helpful for me if someone let me know any best site where I can learn query in MS Access. I searched a number of places everywhere, it is showing through UI Interface but I want to learn query in MS Access.
(SELECT distinct itemname,vendorname,price,count(*)
from vendor_Details1
group by itemname,vendorname,price
order by vendorname) A
inner join
(SELECT distinct itemname,vendorname,price,count(*)
from vendor_Details1
group by itemname,vendorname,price
order by vendorname) B
on A.vendorname=B.vendorname
It is entirely unclear what you are trying to do. However, "join" is an operator in the FROM clause that operates on two tables, views, or subqueries.
The structure of a self-join looks like:
select . . . -- list of columns here
from t as t1 inner join -- you need aliases for the table so you can distinguish the references
t as t2
on t1.? = t2.? -- the join condition goes here
Your query doesn't even have a select.
I would like to JOIN 2 databases.
1 database is keyword_data (keyword mapping)
1 database is filled with Google rankings and other metrics
Somehow I cannot JOIN these two databases.
Some context:
DATA SET NAME: visibility
TABLE 1
keyword_data
VALUES
keyword
universe
category
search_volume
cpc
DATA SET NAME: visibility
TABLE 2
results
VALUES
Date
Keyword
Website
Position
In order to receive ranking data by date I wrote the following SQL line.
SELECT Date, Position, Website FROM `visibility.results` Keyword INNER
JOIN `visibility.keyword_data` keyword ON `visibility.results` Keyword
= `visibility.keyword_data` keyword GROUP BY Date;
(besides that, 100 other lines with no success ;-) )
I am using Google BigQuery for this with standard SQL (unchecked Legacy SQL).
How can I JOIN those 2 data tables?
How familiar are you with SQL? I think you're using aliases wrong, something like this should work
SELECT r.Date, r.Position, r.Website
FROM `visibility.results` AS r
INNER JOIN `visibility.keyword_data` AS k
ON r.Keyword = k.keyword
GROUP BY DATE
First of all i have never worked with Google big query but there is a couple of things wrong in my opinion with this query.
To start with you join tables by including the name of the table then you provide the key that the tables are joined by. Also if you don't use aggregate functions (MIN/MAX etc.) in your select statement you must include all values in the group by clause as well. In reference I can provide you a solution that would work if you would of used Microsoft SQL Server if that would be of any help because if you reference here the syntax is quite similar.
SELECT results.Date AS DATE,
,results.Position AS POSITION
,results.Website AS WEBSITE
FROM visibility.dbo.keyword_data AS keyword_data
INNER JOIN visibility.dbo.results AS results
ON results.keyword = keyword_data.keyword
GROUP BY results.Date
,results.Position
,results.Website
I have five results to retrieve from a table and I want to write a store procedure that will return all desired rows.
I can write the query like that temporarily:
Select * from Table where Id = 1 OR Id = 2 or Id = 3
I supposed I need to receive a list of Ids to split, but how do I write the WHERE clause?
So, if you're just trying to learn SQL, this is a short and good example to get to know the IN operator. The following query has the same result as your attempt.
SELECT *
FROM TABLE
WHERE ID IN (SELECT ID FROM TALBE2)
This translates into what is your attempt. And judging by your attempt, this might be the simplest version for you to understand. Although, in the future I would recommend using a JOIN.
A JOIN has the same functionality as the previous code, but will be a better alternative. If you are curious to read more about JOINs, here are a few links from the most important sources
Joins - wikipedia
and also a visual representation of how different types of JOIN work
Another way to do it. The inner join will only include rows from T1 that match up with a row from T2 via the Id field.
select T1.* from T1 inner join T2 on T1.Id = T2.Id
In practice, inner joins are usually preferable to subqueries for performance reasons.
Is there a way of joining results from 2 tables without using JOIN or SELECT from more than one table? The reason being the database im working with requires queries that only contain SELECT, FROM, and WHERE clauses containing only one distinct table. I do, however, need information from other tables for the project i'm working on.
More info: the querier returns the query results in a .csv format, is there something we can manipulate there?
Pick a programming language. Any language will do. Run one query, and get the results. Run another query, get the results. Use the programming language to combine the results.
Seriously. You are asking how to join data from a database that doesn't support joins. If the database doesn't support it, you're going to have to do it externally.
select a.*, b.* from tablea a, tableb b
You can do it either by Using JOIN or SELECT. You have to use one of it. By Join you must be knowing. I am writing an example for without using JOIN and just using SELECT, to join two tables.
SELECT * from Table1, Table2 where Table1.common_attribute = Table2.common_attribute;