I have two tables, one for all the foods which contains food id, default name and other foods values.
Another table is for the food name translations which contains food id, language id, translation.
What i want to do is join between these tables by the food id to get the translation for food id = 5 for example and language id = 1 which is Spanish for example. and i do it by:
SELECT *
FROM Foods
INNER JOIN FoodNameTranslations USING(Food_ID)
WHERE Food_ID = 5
AND Language_ID = 1
Now what if the the 'FoodNameTranslations' table doesn't have a translation for Food_ID 5 and Language 1?
then i want to simply get the food row with food id = 5 from the 'Foods' table (that contains the default name).
How can i make one query that does this? thanks!
You would do a LEFT JOIN and put the language ID into the join condition.
SELECT
COALESCE(t.TranslatedName, f.DefaultName) FoodName
FROM
Foods f
LEFT JOIN FoodNameTranslations t ON t.Food_ID = f.Food_ID AND t.Language_ID = 1
WHERE
f.Food_ID = 5
You cando do this by changing the JOIN condition:
INNER JOIN gets all records that are common between both tables based on the supplied ON clause.
LEFT JOIN gets all records from the LEFT linked and the related record from the right table ,but if you have selected some columns from the RIGHT table, if there is no related records, these columns will contain NULL.
RIGHT JOIN is like the above but gets all records in the RIGHT table.
FULL JOIN gets all records from both tables and puts NULL in the columns where related records do not exist in the opposite table.
Try using LEFT JOIN instead INNER JOIN, you query will be like this:
SELECT *
FROM Foods
LEFT JOIN FoodNameTranslations USING(Food_ID)
WHERE Food_ID = 5
AND Language_ID = 1
Related
I'm trying to fetch certain data by using a column that exists in all 3 tables, I have three tables
[Txn].[TxnPaymentResponse]
[Txn].[Txn]
[Txn].[TxnLineItem]
Right now if I run the query, I'm able to get the correct data only userID.
But I want to grab another piece of information (suppose that call column X) from the 3rd table (TxnLineItem). That column doesn't exist in the first 2 tables. In this scenario how could I perform inner join and show that piece of info in the query?
DECLARE #CompletedTransactionSince DATETIME2(7) = '2022-09-13 00:00:00.000000'
SELECT DISTINCT
t.UserID
FROM
[Txn].[Txn] T WITH(NOLOCK)
INNER JOIN
[Txn].[TxnPaymentResponse] TPR WITH(NOLOCK) ON T.[TxnID] = TPR.[TxnID]
WHERE
TPR.[PaymentResponseType] = 'FINAL'
AND TPR.[AuthorizedAmount] > CONVERT(DECIMAL(9,3), 0)
AND (#CompletedTransactionSince IS NULL OR
T.[CreatedOn] > #CompletedTransactionSince)
Results from my query:
UserID
C1671FDA-70A8-4C07-BBDF-ACD06ADD145F
Table 3:
TxnID
StandardProductCategory
6FE0D0D0-9959-41AA-9BF0-00000003DED8
Carwash
D1B0EA51-C476-488C-A140-0000C1C7D099
General
Suppose I'm doing inner join like
INNER JOIN
[Txn].[TxnLineItem] TXL WITH(NOLOCK) ON T.[TxnID] = [Txn].[TxnID],
But my I want to grab the X column that has the same transactionID. I want to display UserID that has a Carwash only. Not sure if it's possible to write another clause with an inner join.
As per "I want to display UserID that has a Carwash only", you need to exclude records.
Just add these EXISTS and NOT EXISTS clauses at the end of to query.
EXISTS part is filter users that has CarWash.
NOT EXISTS part is exclude users that has StandardProduct Category records other than Car Wash
......
AND (#CompletedTransactionSince IS NULL OR
T.[CreatedOn] > #CompletedTransactionSince)
AND EXISTS ( SELECT 1 FROM [Txn].[TxnLineItem] TXL
WHERE T.[TxnID] = [Txn].[TxnID]
AND TXL.StandardProductCategory='Carwash')
AND NOT EXISTS( SELECT 1 FROM [Txn].[TxnLineItem] TXL
WHERE T.[TxnID] = [Txn].[TxnID]
AND TXL.StandardProductCategory=<>'Carwash')
I have three tables: patron, patron_address, and patron_phone
for every patron/
Patron has 1-3 Patron_address rows
patron_address has 0-4
I want to display all the rows from the patron table and all the phone numbers of phone_type = '4'.
However, when I use the query below, I only get rows that have a phone{type of 4, not all the patron rows.
I tried to get Access 2007 query designer to do this, but something is off-kilter. Patron_address rows have an address_type. Only patron_address rows with address_type 1 have a child phone record.
So how do I get all the patron rows regardless of whether they have a patron_phone of phone_type 1?
SELECT
PATRON.patron_id, PATRON_PHONE.PHONE_TYPE,
PATRON_PHONE.PHONE_NUMBER, PATRON_ADDRESS.ADDRESS_TYPE
FROM
(PATRON
INNER JOIN
PATRON_ADDRESS ON PATRON.PATRON_ID = PATRON_ADDRESS.PATRON_ID)
LEFT JOIN
PATRON_PHONE ON PATRON_ADDRESS.ADDRESS_ID = PATRON_PHONE.ADDRESS_ID
WHERE
(((PATRON_PHONE.PHONE_TYPE) = '4'))
ORDER BY
PATRON.patron_id;
If I add the criterion that the address type must equal 1, I get absolutely nothing back, even though this combination exists in the database. Isn't the behavior I want the point of a left outer join? Thanks.
You have an INNER JOIN from the Patron table to Patron_Addr. This means that there must be matching records in both tables (by PATRON_ID) to return a value.
SELECT PATRON.patron_id, PATRON_PHONE.PHONE_TYPE, PATRON_PHONE.PHONE_NUMBER, PATRON_ADDRESS.ADDRESS_TYPE
FROM PATRON
INNER JOIN PATRON_ADDRESS ON PATRON.PATRON_ID = PATRON_ADDRESS.PATRON_ID
LEFT JOIN PATRON_PHONE ON PATRON_ADDRESS.ADDRESS_ID = PATRON_PHONE.ADDRESS_ID
WHERE PATRON_PHONE.PHONE_TYPE = 4
ORDER BY PATRON.patron_id
You have a LEFT JOIN from address to table so there doesn't need to be a matching phone number.
Since you are filtering for a Phone Type of 4, it will ONLY allow records that do have a phone record where the PHONE_TYPE = 4.
Is your Phone Type field a number or text? SQL Server will try to convert them back and forth but others may not and give an error or just not match - I don't remember how Access might handle this situation.
If you remove the PHONE TYPE criteria, your address criteria should work.
If you want to get all records of parton with address 1 but only phone numbers that are TYPE = 4, change the WHERE PHONE_TYPE=4 to part of the LEFT JOIN:
SELECT PATRON.patron_id, PATRON_PHONE.PHONE_TYPE, PATRON_PHONE.PHONE_NUMBER, PATRON_ADDRESS.ADDRESS_TYPE
FROM PATRON
INNER JOIN PATRON_ADDRESS ON PATRON.PATRON_ID = PATRON_ADDRESS.PATRON_ID
LEFT JOIN PATRON_PHONE ON PATRON_ADDRESS.ADDRESS_ID = PATRON_PHONE.ADDRESS_ID AND PATRON_PHONE.PHONE_TYPE = 4
WHERE PATRON_PHONE.ADDRESS_TYPE = 1
ORDER BY PATRON.patron_id
Access SQL:
SELECT PATRON.patron_id, P_PHONE.PHONE_TYPE, P_PHONE.PHONE_NUMBER, PATRON_ADDRESS.ADDRESS_TYPE
FROM PATRON
INNER JOIN PATRON_ADDRESS ON PATRON.PATRON_ID = PATRON_ADDRESS.PATRON_ID
LEFT JOIN [SELECT * FROM PATRON_PHONE WHERE PATRON_PHONE.PHONE_TYPE = 4 ]. AS P_PHONE ON PATRON_ADDRESS.ADDRESS_ID = P_PHONE.ADDRESS_ID
WHERE PATRON_PHONE.ADDRESS_TYPE = 1
ORDER BY PATRON.patron_id
Access has some goofy syntax for subqueries. You could create a separate query for the P_Phone subquery instead but the results would (should?) be the same.
I want to retrieve data from 4 tables. Patient table has id as PK which is the foreign key in other three tables ett, phar and ssc. Where a patient lie in only one category. i.e patient id pt1 exists in either of the 3 tables. now I want to retrieve patient info along with its associated category.
My query is:
SELECT *
FROM Patient p
INNER JOIN ETT t
ON p.Patient_ID = t.Patient_ID || INNER JOIN Pharmacological ph
ON p.Patient_ID = ph.Patient_ID
I used OR clause because I want only 1 inner join executing at one time. but its not giving me results, any suggestions??
....Patient table has ID as PK which is the foreign key in other three
tables name: ett, phar and ssc where a patient lie in only one
category. Example, patient id pt1 exists in either of the 3 tables.
Based on your statement, you can join all the tables in table Patient using LEFT JOIN since a record can only exist on one table. The query below uses COALESCE which returns the first non-null value with int the list.
The only thing you need is to manually specify the column names that you want to be shown on the list as shown below.
SELECT a.*,
COALESCE(t.colA, p.ColA, s.ColA) ColA,
COALESCE(t.colB, p.ColB, s.ColB) ColB,
COALESCE(t.colN, p.ColN, s.ColN) ColN
FROM Patient a
LEFT JOIN ETT t
ON a.Patient_ID = t.Patient_ID
LEFT JOIN Phar p
ON a.Patient_ID = p.Patient_ID
LEFT JOIN SSC s
ON a.Patient_ID = s.Patient_ID
To further gain more knowledge about joins, kindly visit the link below:
Visual Representation of SQL Joins
For or - do not ise ||, use "or"
You cannot join with or, you need re-format your query.
I have problems joining 2 table let say I have a column on the 1st table name nationalitycode(this is number) and it fetches the description(it could be american, chinese etc) depending on the first table nationalitycode. So I tried inner join the table so the first inner join is good and working perfectly.
here is the code:
SELECT person.firstnm, person.middlenm, person.lastnm, refcd.description
FROM person
INNER JOIN refcd
ON person.natcd = refcd.id;
However when I try to join the 2nd column from the 1st table let say the column name is gencd(gendercode its a foreign key) but when I updated the query to inner join 2 column from one table getting the value from one column in the 2nd table I get this error.
"Column ambigously defined" I get this error and I understand this my question is is there anyway to achieve my desired output? I want to join 2 table, specifically joining 2 column on table 1 to 1 column in table 2.
Here is my updated query:
SELECT person.firstnm, person.middlenm, person.lastnm, refcd.description
FROM person
INNER JOIN refcd
ON person.natcd = refcd.id
INNER JOIN refcd
ON person.gencd = refcd.id;
Help is really appreciated.
Your query should be
SELECT person.firstnm, person.middlenm, person.lastnm, refcd.description
FROM person INNER JOIN refcd ON person.natcd = refcd.id
INNER JOIN refcd R2 ON person.gencd = R2.id;
Please go thourgh Attached Image where i descirbed my scenario:
I want SQL Join query.
Have a look at something like
SELECT *
FROM Orders o
WHERE EXISTS (
SELECT 1
FROM OrderBooks ob INNER JOIN
Books b ON ob.BookID = b.BookID
WHERE o.OrderID = ob.OrderID
AND b.IsBook = #IsBook
)
The query will return all orders based on the given criteria.
So, what it does is, when #IsBook = 1 it will return all Orders where there exists 1 or more entries linked to this order that are Books. And if #IsBook = 0 it will return all Orders where there exists 1 or more entries linked to this order that are not Books.
Inner join is a method that is used to combine two or more tables together on base of common field from both tables. the both keys must be of same type and of length in regardless of name.
here is an example,
Table1
id Name Sex
1 Akash Male
2 Kedar Male
similarly another table
Table2
id Address Number
1 Nadipur 18281794
2 Pokhara 54689712
Now we can perform inner join operation using the following Sql statements
select A.id, A.Name, B.Address, B.Number from Table1 A
INNER JOIN Table2 B
ON A.id = B.id
Now the above query gives one to one relation details.