Search results
Results from the WOW.Com Content Network
A Venn diagram representing the full join SQL statement between tables A and B. A join clause in the Structured Query Language ( SQL ) combines columns from one or more tables into a new table. The operation corresponds to a join operation in relational algebra .
Title Authors ----- ----- SQL Examples and Guide 4 The Joy of SQL 1 An Introduction to SQL 2 Pitfalls of SQL 1 Under the precondition that isbn is the only common column name of the two tables and that a column named title only exists in the Book table, one could re-write the query above in the following form:
Web SQL Database is a deprecated web browser API specification for storing data in databases that can be queried using SQL variant. [ 1 ] [ 2 ] The technology was only ever implemented in Blink-based browsers like Google Chrome and the new Microsoft Edge , and WebKit-based browsers like Safari .
SQL was initially developed at IBM by Donald D. Chamberlin and Raymond F. Boyce after learning about the relational model from Edgar F. Codd [12] in the early 1970s. [13] This version, initially called SEQUEL (Structured English Query Language), was designed to manipulate and retrieve data stored in IBM's original quasirelational database management system, System R, which a group at IBM San ...
The recursive join is an operation used in relational databases, also sometimes called a "fixed-point join". It is a compound operation that involves repeating the join operation, typically accumulating more records each time, until a repetition makes no change to the results (as compared to the results of the previous iteration).
In a SQL database query, a correlated subquery (also known as a synchronized subquery) is a subquery (a query nested inside another query) that uses values from the outer query. This can have major impact on performance because the correlated subquery might get recomputed every time for each row of the outer query is processed.
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!
From Wikipedia, the free encyclopedia. Redirect page