Figure Q3.13 The Ch03_VENDINGCO database tables Table Name: BOOTH BOOTH _PRODUCT BOOTH _PRICE Chips 1.5 Cola 1.25 Energy Drink 2 Table Name: MACHINE MACHINE _PRODUCT MACHINE _PRICE Chips 1.25 Chocolate Bar 1 Energy Drink 2 Write the relational algebra formula to apply a UNION relational operator to thetables shown in Figure Q3.13
SQL
SQL stands for Structured Query Language, is a form of communication that uses queries structured in a specific format to store, manage & retrieve data from a relational database.
Queries
A query is a type of computer programming language that is used to retrieve data from a database. Databases are useful in a variety of ways. They enable the retrieval of records or parts of records, as well as the performance of various calculations prior to displaying the results. A search query is one type of query that many people perform several times per day. A search query is executed every time you use a search engine to find something. When you press the Enter key, the keywords are sent to the search engine, where they are processed by an algorithm that retrieves related results from the search index. Your query's results are displayed on a search engine results page, or SER.
Figure Q3.13 The Ch03_VENDINGCO
Table Name: BOOTH
|
BOOTH _PRODUCT |
BOOTH _PRICE |
|
Chips |
1.5 |
|
Cola |
1.25 |
|
Energy Drink |
2 |
Table Name: MACHINE
|
MACHINE _PRODUCT |
MACHINE _PRICE |
|
Chips |
1.25 |
|
Chocolate Bar |
1 |
|
Energy Drink |
2 |
- Write the relational algebra formula to apply a UNION relational operator to the
tables shown in Figure Q3.13
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