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2. Cursor (databases) - Wikipedia

   en.wikipedia.org/wiki/Cursor_(databases)

   Cursor (databases) In computer science, a database cursor is a mechanism that enables traversal over the records in a database. Cursors facilitate subsequent processing in conjunction with the traversal, such as retrieval, addition and removal of database records. The database cursor characteristic of traversal makes cursors akin to the ...

3. Tutorial - Wikipedia

   en.wikipedia.org/wiki/Tutorial

   A tutorial, in education, is a method of transferring knowledge and may be used as a part of a learning process. More interactive and specific than a book or a lecture, a tutorial seeks to teach by example and supply the information to complete a certain task. A tutorial can be taken in many forms, ranging from a set of instructions to complete ...

4. Join (SQL) - Wikipedia

   en.wikipedia.org/wiki/Join_(SQL)

   Join (SQL) 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. Informally, a join stitches two tables and puts on the same row records ...

5. Syntax diagram - Wikipedia

   en.wikipedia.org/wiki/Syntax_diagram

   Syntax diagram. Syntax diagrams (or railroad diagrams) are a way to represent a context-free grammar. They represent a graphical alternative to Backus–Naur form, EBNF, Augmented Backus–Naur form, and other text-based grammars as metalanguages. Early books using syntax diagrams include the "Pascal User Manual" written by Niklaus Wirth [1 ...

6. MongoDB - Wikipedia

   en.wikipedia.org/wiki/MongoDB

   MongoDB. MongoDB is a source-available, cross-platform, document-oriented database program. Classified as a NoSQL database product, MongoDB utilizes JSON -like documents with optional schemas. MongoDB is developed by MongoDB Inc. and current versions are licensed under the Server Side Public License (SSPL).

7. Condition (SQL) - Wikipedia

   en.wikipedia.org/wiki/Condition_(SQL)

   The EXISTS condition uses the SQL standard keyword EXISTS to determine whether rows exist in a subquery result. Examples. To SELECT one row of data from a table called tab with a primary key column (pk) set to 100 — use the condition pk = 100:

8. SQL Plus - Wikipedia

   en.wikipedia.org/wiki/SQL_Plus

   Oracle's SQL Plus Worksheet is a straight-forward, easy-to-use, graphical user interface for SQL. ^ "ISQLPlus". Oracle FAQ. 2008-02-29. Retrieved 2008-11-21. iSQLPlus (iSQL Plus) is a web-based utility similar to the SQL Plus command line utility for executing SQL and PL/SQL commands (available up to Oracle 10gR2).

9. Query plan - Wikipedia

   en.wikipedia.org/wiki/Query_plan

   Query plan. A query plan (or query execution plan) is a sequence of steps used to access data in a SQL relational database management system. This is a specific case of the relational model concept of access plans. Since SQL is declarative, there are typically many alternative ways to execute a given query, with widely varying performance.