The command DESC DEPARTMENTS shows the following information Name Null? Type DEPARTMENT ID NOT NULL NUMBER (4) DEPARTMENT NAME NOT NULL VARCHAR2 (30) MANAGERID NUMBER (6) LOCATION ID NUMBER (4) Which of the following is correct? This table has a primary key. This table has a foreign key. This table has both primary and foreign keys. This table has neither primary nor foreign keys. Not enough information to answer.
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.
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