如何使用引用多个表的SQL查询访问数据？

Question

I have a few tables and inserted values into them using SQL plus:

INSERT INTO Location(name, addr, phone) 
VALUES ('Texas Branch', '4832 Deercove Drive, Dallas, TX 75208', '214-948-7102');

INSERT INTO Librarian(eid, ID, pay, Loc_name) 
VALUES (2591051, 88564, 30000.00, 'Texas Branch');

INSERT INTO Stored_In(media_id, name) 
VALUES (8733, 'Texas Branch');

Suppose I write a SQL query like select location = "texas branch" , then the output should contain the librarian for the Texas branch and media_id , the name stored_in - in simple words, I should get all the information related to Texas branch)

Can anyone please help write the SQL query?

Answer 1

Something along the lines of:

SELECT * FROM (
    Location
    INNER JOIN 
    Librarian ON Location.name = Librarian.Loc_name
    INNER JOIN 
    Stored_In ON Stored_In.name = Location.name
)
WHERE(
    Location.name='Texas Branch'
)

Because of the SELECT * you will get a bunch of duplicate fields and you should replace this with the proper select.

As others have said, Google JOIN s and understand them.

Answer 2

You need to use joins then the SQL is straightforward. If that is unclear then maybe you need to do some homework.