What is the purpose of SQL keywords?

SQL AS keyword is used to give an alias to table or column names in the queries. In this way, we can increase the readability and understandability of the query and column headings in the result set.

What are keywords in database?

Keywords, also commonly called search terms, are the words that you enter into the database search boxes. They represent the main concepts of your research topic and are the words used in everyday life to describe the topic.

Is type an SQL keyword?

TYPE is not a SQL command. However, I would avoid it for 2 reasons: “datatype” is referred to several times in SQL documentation (assuming this means string, int, float. type() will be a reserved word in many programming languages that you want to use in cooperating with a SQL datastore.

What is key in SQL table?

An SQL key is either a single column (or attribute) or a group of columns that can uniquely identify rows (or tuples) in a table. SQL keys ensure that there are no rows with duplicate information. Not only that, but they also help in establishing a relationship between multiple tables in the database.

Is a reserved SQL keyword?

Reserved words are SQL keywords and other symbols that have special meanings when they are processed by the Relational Engine. If a reserved word is used as an object name, it must be enclosed in double-quotes to notify the Relational Engine that the word is not being used as a keyword in the given context.

What are the 5 types of primary key?

Let’s look at each of them separately.

• Primary Key. A primary key is a column of a table or a set of columns that helps to identify every record present in that table uniquely.
• Super Key.
• Candidate Key.
• Alternate Key.
• Foreign Key.
• Composite Key.
• Unique Key.

Which SQL keyword is used to retrieve only unique values?

Distinct in SQL is a commonly used keyword meant to retrieve values from a table and eliminate duplicates. The SQL SELECT DISTINCT statement will only retrieve unique values from the selected table.

What are SQL keys?

SQL Keys Overview. In SQL, keys are used to maintain referential integrity among relations. Put simply, this means keys allow tables to reference each other, and each reference will be “correct” every time. Referential integrity also prevents records from being “dangled” or “orphaned” by another record that has been deleted.

How do you search in SQL?

To search for objects: In SQL Server Management Studio or Visual Studio’s menu, from the ApexSQL menu, click ApexSQL Search. Select the Object search command: In the Search text field, enter the text that needs to be searched (e.g. a variable name)

What does the key keyword mean in MySQL?

What does the KEY keyword mean in MySQL? Key is synonymous to an index. If you want to create an index for a column, then use ‘Key’. As stated in the official docs: KEY is normally a synonym for INDEX. The key attribute PRIMARY KEY can also be specified as just KEY when given in a column definition.