Computer Science, asked by saurabharushmishra25, 11 months ago

what is SQL example all element of SQL​

Answers

Answered by queensp73
4

Answer:

SQL-Structured Query  Language .

ELEMENTS:

Keywords

Each SQL statement contains one or more keywords. eg: true,class,else.none..etc..

Identifiers

Identifiers are names of objects in the database, such as user IDs, tables, and columns. eg:(_)

Strings

Strings are either literal strings, or expressions with CHAR or VARCHAR data types. eg:"queensp"

Expressions

Expressions are formed from several different kinds of elements, such as constants, column names, SQL operators, and subqueries. eg:a+b>c**d or a*b<c*d

Search Conditions

Conditions are used to choose a subset of the rows from a table, or in a control statement such as an IF statement to determine control of flow.

Special Values

Special values can be used in expressions, and as column defaults when creating tables.

Variables

Sybase IQ supports local variables, connection-level variables, and global variables.

Comments

Use comments to attach explanatory text to SQL statements or statement blocks. The database server does not execute comments.

NULL Value

Use NULL to specify a value that is unknown, missing, or not applicable.

Explanation:

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