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An INNER JOIN between two tables means that the joining values have to be present in both tables, while an FULL JOIN means that the values can be in either of the two tables. This is also know as a FULL OUTER JOIN.
As an example, imagine a customer table with a code,name and type and an auxiliary table with a type id and type description;
select * from Customer
1 Record One 001
2 Number 2 001
3 The third 002
Select * from CustomerType
001 Type_one
003 Another One
(you'll notice that the type code '002' is missing).
select Customer.Name, Customer.TypeCode, TypeCode.Description from Customer INNER JOIN CustomerType on (CustomerType.Code = Customer.TypeCode)
Record One 001
Number 2 001
(The third record is missing because there wasn't a corresponding value in the CustomerType table for the inner join)
select Customer.Name, Customer.TypeCode, TypeCode.Description from Customer FULL JOIN CustomerType on (CustomerType.Code = Customer.TypeCode)
Record One 001
Number 2 001
The third 002
(Which works because of the FULL - aka OUTER - JOIN)
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What is the difference between join and inner join?
One is inner the other is not... Plum
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If you do not explicitly state the type of join (inner, outer, left, right) then the database will handle the query as an inner join query even though you did not specify it as such. All multi-table queries are inner joins unless specified otherwise.
Difference between select and inner join?
The select command is the mechanism for retrieving records from a SQL database. In it's simplest form, this would be FROM a single table, for example - select * from CustomerTable.When data is needed from multiple tables, each pair of tables has to be linked together using a JOIN. The easiest type of join is an INNER JOIN, which expects the data to be in both tables. For example, if a customer record had a 'STATE' code which looked up against the US States and we want our SELECT to return the State name as well as the customer code, it would look something like this;SELECT CustomerCode, CustomerName, StateName FROM Customer INNER JOIN State on (State.ID = Customer.StateCode)
