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  2. Object–relational mapping - Wikipedia

    en.wikipedia.org/wiki/Object–relational_mapping

    For example, consider an address book entry that represents a single person along with zero or more phone numbers and zero or more addresses. This could be modeled in an object-oriented implementation by a "Person object " with an attribute/field to hold each data item that the entry comprises: the person's name, a list of phone numbers, and a ...

  3. Database trigger - Wikipedia

    en.wikipedia.org/wiki/Database_trigger

    In the examples below each trigger is modifying a different table, by looking at what is being modified you can see some common applications of when different trigger types are used. The following is an Oracle syntax example of a row level trigger that is called AFTER an update FOR EACH ROW affected.

  4. PostgreSQL - Wikipedia

    en.wikipedia.org/wiki/PostgreSQL

    PostgreSQL (/ ˌ p oʊ s t ɡ r ɛ s k j u ˈ ɛ l / POHST-gres-kew-EL) [11] [12] also known as Postgres, is a free and open-source relational database management system (RDBMS) emphasizing extensibility and SQL compliance.

  5. Data definition language - Wikipedia

    en.wikipedia.org/wiki/Data_definition_language

    A commonly used CREATE command is the CREATE TABLE command. The typical usage is: CREATE TABLE [table name] ( [column definitions]) [table parameters] The column definitions are: A comma-separated list consisting of any of the following; Column definition: [column name] [data type] {NULL | NOT NULL} {column options} Primary key definition ...

  6. Merge (SQL) - Wikipedia

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

    Some database implementations adopted the term upsert (a portmanteau of update and insert) to a database statement, or combination of statements, that inserts a record to a table in a database if the record does not exist or, if the record already exists, updates the existing record. This synonym is used in PostgreSQL (v9.5+) [2] and SQLite (v3 ...

  7. Do you overplan the holidays? You might be missing the point

    www.aol.com/overplan-holidays-might-missing...

    “Come up with five things you enjoy most, prioritize those things, and don’t feel that you have to do bigger and better than the year before,” she said, “because the harder we try to ...

  8. 20 Contest-Winning Desserts That Will Wow a Crowd - AOL

    www.aol.com/20-contest-winning-desserts-wow...

    "Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." In the world of baked goods, there are tasty recipes and then there are top-notch, tried-and-true ...

  9. Create, read, update and delete - Wikipedia

    en.wikipedia.org/wiki/Create,_read,_update_and...

    CRUD is also relevant at the user interface level of most applications. For example, in address book software, the basic storage unit is an individual contact entry. As a bare minimum, the software must allow the user to: [6] Create, or add new entries; Read, retrieve, search, or view existing entries; Update, or edit existing entries