Lesson 13 - Logical and Special Operators in Database Systems

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Database Systems

Structured systems for storing and managing data.

Logical Operators

Operators used to combine conditional statements.

Special Operators

Operators with specific functions in SQL queries.

AND Operator

Returns TRUE if all conditions are TRUE.

OR Operator

Returns TRUE if at least one condition is TRUE.

NOT Operator

Inverts the truth value of a condition.

SQL Query

Command to retrieve or manipulate database data.

IN Operator

Checks if a value matches any in a list.

Truth Table

Table showing all possible truth values.

SQL Condition

Criteria specified in SQL queries to filter results.

SQL OR Operator

Returns rows matching at least one condition.

SQL NOT Operator

Returns opposite Boolean value of condition.

BETWEEN Operator

Checks if value is within a specified range.

IS NULL

Checks if an attribute value is null.

LIKE Operator

Matches a string value against a pattern.

Wildcard %

Matches zero or more characters in LIKE.

Wildcard _

Matches exactly one character in LIKE.

EXISTS Operator

Checks if a subquery returns any rows.

Parentheses in SQL

Used to group conditions for clarity.

SQL Query Structure

SELECT, FROM, WHERE define a query.

Comparison Operators

Used to compare two values in SQL.

Subquery

A query nested within another query.

SQL SELECT Statement

Retrieves data from a database table.

SQL WHERE Clause

Filters records based on specified conditions.

SQL BETWEEN Dates

Compares date values within a range.

SQL Query Example

Demonstrates usage of SQL syntax and operators.

SQL Readability

BETWEEN improves clarity over multiple comparisons.

SQL Data Types

Defines types like integer, varchar, and date.

SQL Pattern Matching

LIKE allows flexible string matching.

SQL Result Set

The output returned by a SQL query.

SQL Column Value

The data contained in a specific column.

SQL Table

A structured collection of data in rows and columns.

SQL Aggregate Functions

Perform calculations on multiple rows of data.