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The idea was that you could do a JOIN to the DUAL table and create two rows in the result for every one row in your table. Then, by using GROUP BY, the resulting join could be summarized to show the amount of storage for the DATA extent and for the INDEX extent(s). The name, DUAL, seemed apt for the process of creating a pair of rows from just one.
Query by Example (QBE) is a database query language for relational databases. It was devised by Moshé M. Zloof at IBM Research during the mid-1970s, in parallel to the development of SQL. [1] It is the first graphical query language, using visual tables where the user would enter commands, example elements and conditions.
Each column in an SQL table declares the type(s) that column may contain. ANSI SQL includes the following data types. [14] Character strings and national character strings. CHARACTER(n) (or CHAR(n)): fixed-width n-character string, padded with spaces as needed; CHARACTER VARYING(n) (or VARCHAR(n)): variable-width string with a maximum size of n ...
For example, think of A as Authors, and B as Books. An Author can write several Books, and a Book can be written by several Authors. In a relational database management system, such relationships are usually implemented by means of an associative table (also known as join table, junction table or cross-reference table), say, AB with two one-to-many relationships A → AB and B → AB.
If you just want one table from a long Excel page, you can select that table from the Calc page. Then copy the table to a new page in Calc. Edit and move columns and rows in Calc. To drag a column first select it by clicking its header number. Then press and hold the ALT key. Then click a data cell, and drag the column to a new location.
A young Russian woman enjoying the beach has died after she was swept away by a large wave in Thailand, multiple news outlets report. Kamilla Beliatskaya, 24, was in Koh Samui, Thailand, on Friday ...
A stowaway who made it all the way from New York to Paris on a flight is expected to be brought back to the U.S. Wednesday afternoon escorted by French security officials.
The Philadelphia 76ers' season might be cursed. Shams Charania of ESPN reported Thursday that Tyrese Maxey, one of the Sixers' stars, is expected to miss a "couple of weeks" with a right hamstring ...