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  2. PL/SQL - Wikipedia

    en.wikipedia.org/wiki/PL/SQL

    Procedures resemble functions in that they are named program units that can be invoked repeatedly. The primary difference is that functions can be used in a SQL statement whereas procedures cannot. Another difference is that the procedure can return multiple values whereas a function should only return a single value. [8]

  3. Select (SQL) - Wikipedia

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

    According to PostgreSQL v.9 documentation, an SQL window function "performs a calculation across a set of table rows that are somehow related to the current row", in a way similar to aggregate functions. [7] The name recalls signal processing window functions. A window function call always contains an OVER clause.

  4. DUAL table - Wikipedia

    en.wikipedia.org/wiki/DUAL_table

    The DUAL table is a special one-row, one-column table present by default in Oracle and other database installations. In Oracle, the table has a single VARCHAR2(1) column called DUMMY that has a value of 'X'. It is suitable for use in selecting a pseudo column such as SYSDATE or USER.

  5. Unique key - Wikipedia

    en.wikipedia.org/wiki/Unique_key

    The Foreign Key serves as the link, and therefore the connection, between the two related tables in this sample database. In a relational database, a candidate key uniquely identifies each row of data values in a database table. A candidate key comprises a single column or a set of columns in a single database table. No two distinct rows or ...

  6. Table (database) - Wikipedia

    en.wikipedia.org/wiki/Table_(database)

    In a database, a table is a collection of related data organized in table format; consisting of columns and rows.. In relational databases, and flat file databases, a table is a set of data elements (values) using a model of vertical columns (identifiable by name) and horizontal rows, the cell being the unit where a row and column intersect. [1]

  7. Here's how a US trade war between Mexico, Canada, and ... - AOL

    www.aol.com/heres-us-trade-war-between-181918916...

    Uncertainty will loom over markets even if Trump doesn't follow through with his trade proposals, and the impact could drag on S&P 500 earnings, analysts say.

  8. 16 Things That Have No Business Being As Expensive As They Are

    www.aol.com/finance/16-things-no-business-being...

    Designer Clothes. You may not want to buy designer if you're watching your budget. The industry standard is for a profit margin between a 2.2 and 2.5 times markup, meaning a dress that cost $100 ...

  9. Today's Wordle Hint, Answer for #1249 on Tuesday, November 19 ...

    www.aol.com/todays-wordle-hint-answer-1249...

    If you’re stuck on today’s Wordle answer, we’re here to help—but beware of spoilers for Wordle 1249 ahead. Let's start with a few hints.