SUBSTRING

Returns a substring of the input starting at start_pos.

Note

Some systems call this function SUBSTR.

See also REGEXP_SUBSTR.

Syntax

SUBSTRING( expr, start_pos, length )

Arguments

Parameter

Description

expr

String expression

start_pos

Starting position (starts at 1)

length

Number of characters to extract

Returns

Returns the same type as the argument supplied.

Notes

  • Character count starts at 1.

  • If the value is NULL, the result is NULL.

Examples

For these examples, assume a table named nba, with the following structure:

CREATE TABLE nba
(
   Name varchar(40),
   Team varchar(40),
   Number tinyint,
   Position varchar(2),
   Age tinyint,
   Height varchar(4),
   Weight real,
   College varchar(40),
   Salary float
 );

Here’s a peek at the table contents (Download nba.csv):

nba.csv

Name

Team

Number

Position

Age

Height

Weight

College

Salary

Avery Bradley

Boston Celtics

0.0

PG

25.0

6-2

180.0

Texas

7730337.0

Jae Crowder

Boston Celtics

99.0

SF

25.0

6-6

235.0

Marquette

6796117.0

John Holland

Boston Celtics

30.0

SG

27.0

6-5

205.0

Boston University

R.J. Hunter

Boston Celtics

28.0

SG

22.0

6-5

185.0

Georgia State

1148640.0

Jonas Jerebko

Boston Celtics

8.0

PF

29.0

6-10

231.0

5000000.0

Amir Johnson

Boston Celtics

90.0

PF

29.0

6-9

240.0

12000000.0

Jordan Mickey

Boston Celtics

55.0

PF

21.0

6-8

235.0

LSU

1170960.0

Kelly Olynyk

Boston Celtics

41.0

C

25.0

7-0

238.0

Gonzaga

2165160.0

Terry Rozier

Boston Celtics

12.0

PG

22.0

6-2

190.0

Louisville

1824360.0

Substring using fixed offsets

Get 4 characters, starting from the 4th character

nba=> SELECT SUBSTRING("Name", 4, 4) FROM nba LIMIT 5;
substring
---------
ry B
Cro
n Ho
. Hu
as J

Truncating strings

Trim a string to 10 characters

nba=> SELECT SUBSTRING("Name", 1, 10) FROM nba LIMIT 5;
substring
----------
Avery Brad
Jae Crowde
John Holla
R.J. Hunte
Jonas Jere