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Conditions: Comparison, AND, OR, BETWEEN, INLocate this document in the navigation structure

Use

To select specific rows, you can use the WHERE clause. In WHERE clauses, you can specify search conditions. Some of these conditions are presented below.

Prerequisites

You can use the demo data for the SQL tutorial. Start the Database Studio as database administrator MONA with the password RED and log on to demo database DEMODB: Logging On to a Database.

SQL Reference Manual, Predicate (predicate)

Activities

You can use Database Studio to enter and execute SQL statements. More information: Working with SQL Statements: Overview

Comparison Conditions

SELECT title, name

  FROM hotel.customer

    WHERE title ='Company'

Selecting the customers that are companies

Result

TITLE

NAME

Company

Datasoft

Company

TOOLware

SELECT firstname, name, zip

  FROM hotel.customer

    WHERE name > 'Randolph'

Selecting the customers that, in alphabetical order, come after Randolph

Result

FIRSTNAME

NAME

ZIP

Sally

Smith

75243

?

TOOLware

20019

See also: SQL Reference Manual, Comparison Predicate (comparison_predicate)

Switches: AND, OR

If AND and OR are both used, make sure that AND has a higher priority than OR. You should use parentheses to illustrate the desired multiple conditions. You can also use multiple parentheses. The system then evaluates the data from the innermost to the outermost parentheses.

SELECT firstname, name, zip

  FROM hotel.customer

    WHERE (title ='Company') AND (name > 'Randolph')

Selecting the customers that, in alphabetical order, come after Randolph and that are companies

Result

FIRSTNAME

NAME

ZIP

?

TOOLware

20019

See also: SQL Reference Manual, Search Condition (search_condition)

Values in a Range: BETWEEN x AND y

SELECT title, name, zip

  FROM hotel.customer

    WHERE zip BETWEEN '10000' AND '30000'

Selection of customers who live in towns with a post code between 10000 and 30000.

Result

TITLE

NAME

ZIP

Mrs

Porter

10580

Mrs

Griffith

20005

Company

TOOLware

20019

Mr

Jenkins

20903

See also: SQL Reference Manual, BETWEEN Predicate (between_predicate)

Values in a Set: IN (x,...)

You can specify the values in the parentheses in any order you desire, since this is a set of values from which a value is to be selected using the IN predicate.

SELECT title, firstname, name

  FROM hotel.customer

    WHERE title IN ('Mr','Mrs')

Selecting all customers who are natural persons (not companies)

Result

TITLE

FIRSTNAME

NAME

Mrs

Jenny

Porter

Mr

Peter

Brown

Mrs

Rose

Brian

Mrs

Mary

Griffith

Mr

Martin

Randolph

Mrs

Sally

Smith

Mr

Mike

Jackson

Mrs

Rita

Doe

Mr

George

Howe

Mr

Frank

Miller

Mrs

Susan

Baker

Mr

Joseph

Peters

Mr

Antony

Jenkins

See also: SQL Reference Manual, IN Predicate (in_predicate)

More Information

More examples for Data Query