Sql query delete all loans taken from branches located in needham city

Question

1.00/5 (2 votes)

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table BRANCH(BRANCH_NAME,BRANCH_CITY,ASSETS)

table loan(LOAN_NUMBER,AMOUNT,BRANCH_NAME)

Delete all loans taken from branches located in Needham city.

What I have tried:

delete
from loan l
where b.branch_name=l.branch_name 
and b.branch_city='Needham city'

Posted 3-Mar-20 8:21am

Abed Al Rahman Hussien Balhawan

Updated 3-Mar-20 8:34am

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MadMyche · Accepted Answer · 2020-03-03T08:34:00

So we want to do some SELECTive deleting of loans based on the Branch City, but we don't have that column in our Loan table, just the Branch Name. Sounds like a good place to start

SQL

DELETE
FROM   Loan
WHERE  Branch_Name -- to be continued

Now we do have a branch table that has the names and cities within it... lets see what this will give us something like this

SQL

SELECT Branch_Name
FROM   Branch
WHERE  Branch_City = 'Needham city'

Now to use this within the DELETE command, we will use the IN to call the SELECT as a subquery

SQL

DELETE
FROM   Loan
WHERE  Branch_Name IN (
     SELECT Branch_Name
     FROM   Branch
     WHERE  Branch_City = 'Needham city'
)