Technically, it returns the result set of a query without WHERE-Clause. As per SQL concern and advancement, there are 3-types of joins and all RDBMS joins can be achieved using these types of …

FULL JOIN: combines the results of both left and right outer joins. The joined table will contain all records from both the tables and fill in NULLs for missing matches on either side. SELF JOIN: joins a …

Dec 22, 2012 · SELECT A.Colour, B.Colour FROM A LEFT OUTER JOIN B ON A.Colour = B.Colour SQL Fiddle Outer Joins are logically evaluated in the same way as inner joins except that if a row …

Nov 1, 2010 · The database does not do joins -- or automatic "linking" between documents. However you can do it yourself client side. If you need to do 2, that is ok, but if you had to do 2000, the …

Joins is meant to filter the result set coming from the database. You use it to do set operations on your table. Think of this as a where clause that performs set theory. Post.joins(:comments) is the same as …

Oct 26, 2010 · That's Oracle specific notation for an OUTER JOIN, because the ANSI-89 format (using a comma in the FROM clause to separate table references) didn't standardize OUTER joins.

Jan 2, 2009 · 21 JOINs: INNER JOIN = JOIN OUTER JOIN LEFT OUTER JOIN = LEFT JOIN RIGHT OUTER JOIN = RIGHT JOIN FULL OUTER JOIN = FULL JOIN CROSS JOIN Self- JOIN: This is not …

9 I shared my experience of using two LEFT JOINS in a single SQL query. I have 3 tables: Table 1) Patient consists columns PatientID, PatientName Table 2) Appointment consists columns …

The question and solutions pertain specifically to INNER JOINs. If the join is a LEFT/RIGHT/FULL OUTER JOIN, then it is not a matter of preference or performance, but one of correct results. The …

Can any one tell me whether below 2 queries are an example of Left Outer Join or Right Outer Join??