Difference between revisions of "Select the oldest person"

Revision as of 15:23, 17 July 2012

How can I select the oldest person in the table PERSON by birthday?

schema:scott

I have a table PERSON(personID, name, sex, birthday, placeOfBirth)

Now I would like to SELECT the oldest person in the table by birthday.

Answer: Use a nested query to find the earliest birthday.

-- Set up the problem
DROP TABLE people;
CREATE TABLE people(personId INTEGER PRIMARY KEY,
                    name VARCHAR(20),
                    sex CHAR(1),
                    birthday DATE,
                    placOfBirth VARCHAR(20));
INSERT INTO people VALUES
  (1,'Oliver','M','25 May 1985','Bedford');
INSERT INTO people VALUES
  (2,'Andrew','M','20 May 1962','Hong Kong');
 
-- Here is the answer
SELECT * FROM people
WHERE birthday = (SELECT MIN(birthday) FROM people)

-- Set up the problem
DROP TABLE people;
CREATE TABLE people(personId INTEGER PRIMARY KEY,
                    name VARCHAR(20),
                    sex CHAR(1),
                    birthday DATE,
                    placOfBirth VARCHAR(20));
INSERT INTO people VALUES
  (1,'Oliver','M','25 May 1985','Bedford');
INSERT INTO people VALUES
  (2,'Andrew','M','20 May 1962','Hong Kong');
 
-- Here is the answer
SELECT * FROM people
WHERE birthday = (SELECT MIN(birthday) FROM people)

-- Set up the problem
DROP TABLE people;
CREATE TABLE people(personId INTEGER PRIMARY KEY,
                    name VARCHAR(20),
                    sex CHAR(1),
                    birthday DATE,
                    placOfBirth VARCHAR(20));
INSERT INTO people VALUES
  (1,'Oliver','M','25 May 1985','Bedford');
INSERT INTO people VALUES
  (2,'Andrew','M','20 May 1962','Hong Kong');
 
-- Here is the answer
SELECT * FROM people
WHERE birthday = (SELECT MIN(birthday) FROM people)

-- Set up the problem
DROP TABLE people;
CREATE TABLE people(personId INTEGER PRIMARY KEY,
                    name VARCHAR(20),
                    sex CHAR(1),
                    birthday DATE,
                    placOfBirth VARCHAR(20));
INSERT INTO people VALUES
  (1,'Oliver','M','25 May 1985','Bedford');
INSERT INTO people VALUES
  (2,'Andrew','M','20 May 1962','Hong Kong');
 
-- Here is the answer
SELECT * FROM people
WHERE birthday = (SELECT MIN(birthday) FROM people)

-- Set up the table
DROP TABLE people;
CREATE TABLE people(personId INTEGER PRIMARY KEY,
                    name VARCHAR(20),
                    sex CHAR(1),
                    birthday DATE,
                    placOfBirth VARCHAR(20));
INSERT INTO people VALUES
  (1,'Oliver','M','1985-05-25','Bedford');
INSERT INTO people VALUES
  (2,'Andrew','M','1962-05-20','Hong Kong');
 
--Here is the answer
SELECT * FROM people
 ORDER BY birthday ASC
 LIMIT 1

-- Set up the problem
DROP TABLE people;
CREATE TABLE people(personId INTEGER PRIMARY KEY,
                    name VARCHAR(20),
                    sex CHAR(1),
                    birthday DATE,
                    placOfBirth VARCHAR(20));
INSERT INTO people VALUES
  (1,'Oliver','M','25 May 1985','Bedford');
INSERT INTO people VALUES
  (2,'Andrew','M','20 May 1962','Hong Kong');
 
-- Here is the answer
SELECT * FROM people
WHERE birthday = (SELECT MIN(birthday) FROM people)

DATE and TIME Operations

Date and time types

Format a date and time

Specify a date

Match a range of dates

Select the oldest person

Select a record with the latest date

YYYYMMDD date format

Getting the latest record

@@ Line 3: / Line 3: @@
 <div class=params>schema:scott</div>
 <div>
-I have a table <tt>PERSON(<u>personID</u>,
+I have a table
+<tt>PERSON(<u>personID</u>,
 name,
 sex,

Difference between revisions of "Select the oldest person"

Revision as of 15:23, 17 July 2012

Personal tools

Namespaces

Variants

Views

Actions

Search

Reference

Toolbox

Google AdSense