Substring sql developer

Substring sql developer DEFAULT

SUBSTR

Syntax

substr::=

Description of substr.gif follows
Description of the illustration substr.gif

Purpose

The functions return a portion of , beginning at character , characters long. calculates lengths using characters as defined by the input character set. uses bytes instead of characters. uses Unicode complete characters. uses UCS2 code points. uses UCS4 code points.

  • If is 0, then it is treated as 1.

  • If is positive, then Oracle Database counts from the beginning of to find the first character.

  • If is negative, then Oracle counts backward from the end of .

  • If is omitted, then Oracle returns all characters to the end of . If is less than 1, then Oracle returns null.

can be any of the datatypes , , , , , or . Both and must be of datatype , or any datatype that can be implicitly converted to , and must resolve to an integer. The return value is the same datatype as . Floating-point numbers passed as arguments to are automatically converted to integers.

Examples

The following example returns several specified substrings of "ABCDEFG":

SELECT SUBSTR('ABCDEFG',3,4) "Substring" FROM DUAL; Substring --------- CDEF SELECT SUBSTR('ABCDEFG',-5,4) "Substring" FROM DUAL; Substring --------- CDEF

Assume a double-byte database character set:

SELECT SUBSTRB('ABCDEFG',5,4.2) "Substring with bytes" FROM DUAL; Substring with bytes -------------------- CD
Sours: https://docs.oracle.com/cd/B19306_01/server.102/b14200/functions162.htm

PLSQL | SUBSTR Function

The PLSQL SUBSTR function is used for extracting a substring from a string.
The SUBSTR function accepts three parameters which are input_string, start_position, length.
SUBSTR calculates lengths using characters as defined by the input character set. SUBSTRB uses bytes instead of characters.

Note:

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  • If position is 0, then it is treated as 1.
  • If position is positive, then Oracle Database counts from the beginning of char to find the first character.
  • If position is negative, then Oracle counts backward from the end of char.
  • If substring_length is omitted, then Oracle returns all characters to the end of char. If substring_length is less than 1, then Oracle returns null.

Syntax:

SUBSTR( input_string, start_position, length)

Parameters Used:



  1. input_string – It is used to specify the source string.
  2. start_position – It is used to specify the starting position for extraction.
  3. length – It is an optional parameter which is used to specify the number of characters to extract.

Return Value:
The SUBSTR function in PLSQL returns a string value.

Supported Versions of Oracle/PLSQL:

  1. Oracle 12c
  2. Oracle 11g
  3. Oracle 10g
  4. Oracle 9i
  5. Oracle 8i

Example-1: Passing all the three arguments in the SUBSTR function.

DECLARE Test_String string(25) := 'Geeksforgeeks'; BEGIN dbms_output.put_line(SUBSTR(Test_String, '6', '3')); END;

Output:

for

Example-2: Omitting the length argument while passing parameters to the SUBSTR function.

DECLARE Test_String string(25) := 'Geeksforgeeks'; BEGIN dbms_output.put_line(SUBSTR(Test_String, '6')); END;

Output:

forgeeks

Example-3: Passing a negative value in the starting_position argument while passing the parameters to the SUBSTR function.

DECLARE Test_String string(25) := 'Geeksforgeeks'; BEGIN dbms_output.put_line(SUBSTR(Test_String, '-6', '3')); END;

Output:

rge

SUBSTR function starts from the end of the string and counts backwards if the starting-position argument has a negative value.

Example-4: Passing a value in the starting_position argument which is greater than the number of characters in the input_string.

DECLARE Test_String string(25) := 'Geeksforgeeks'; BEGIN dbms_output.put_line(SUBSTR(Test_String, '-16', '3')); END;

Output:

NULL

SUBSTR function returns NULL since the number of characters present in the input_string is less than the value passed in the starting-position argument.

Advantage:
Floating-point numbers passed as arguments to SUBSTR are automatically converted to integers.

Sours: https://www.geeksforgeeks.org/plsql-substr-function/
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SUBSTR - Get Substring from String - Oracle to SQL Server Migration

In Oracle, SUBSTR function returns the substring from a string starting from the specified position and having the specified length (or until the end of the string, by default).

In Server, you can use SUBSTRING function, but it does not allow you to specify a negative start position, and the substring length must be specified .

Oracle:

-- Get first 3 charactersSELECT SUBSTR('New York', 1, 3)FROM dual; # New   -- Get last 4 characters (negative start position)SELECT SUBSTR('New York',-4)FROM dual; # York

Server:

-- Get first 3 charactersSELECT SUBSTRING('New York', 1, 3); # New   -- Get last 4 characters SELECTRIGHT('New York', 4); # York

SUBSTR Conversion Overview

Summary information:

Oracle Server
Syntax SUBSTR(string, start [, length]) SUBSTRING(string, start, length)
Negative Start Positionstart counted from the end of string
Length Optional, until the end of string by default Must be specified
Alternatives LEFT function if start is 1
RIGHT function if length is not specified

Last Update: Oracle 11g R2 and Microsoft Server 2012

Converting Oracle SUBSTR to SQL Server

If Oracle SUBSTR function is used with a positive start position, and the length is specified you can convert it to SUBSTRING in Server:

Oracle:

-- Get 4 characters starting from position 5SELECT SUBSTR('New York', 5, 4)FROM dual; # York

Server:

-- Get 4 characters starting from position 5SELECT SUBSTRING('New York', 5, 4); # York

Default Length

In Oracle, if the length is not specified, the substring is taken from the start position until the end of the string. In Server, the length must be specified, and you can use LEN function to provide the length parameter:

Oracle:

-- Get substring from position 5 until the end of stringSELECT SUBSTR('New York', 5)FROM dual; # York

Server:

[email protected] VARCHAR(10)='New York';   -- Get substring from position 5 until the end of stringSELECT SUBSTRING(@str, 5, LEN(@str)); # York

Additionally, you can use RIGHT function to convert Oracle SUBSTR used without the length:

Server:

[email protected] VARCHAR(10)='New York';   -- Get substring from position 5 until the end of stringSELECTRIGHT(@str, LEN(@str)+ 1 - 5); # York

Negative Start Position

In Oracle, if the start position is negative SUBSTR function calculates it from the end of the string. In Server, you can use SUBSTRING and LEN functions:

Oracle:

-- Get 3 characters from position 4 counting from the end of stringSELECT SUBSTR('New York',-4, 3)FROM dual; # Yor

Server:

[email protected] VARCHAR(10)='New York';   -- Get 3 characters from position 4 counting from the end of stringSELECT SUBSTRING(@str, LEN(@str)+ 1 - 4, 3); # Yor

If the negative start position is specified, but the length is omitted, you can also use RIGHT function in Server:

Oracle:

-- Get last 4 characters in stringSELECT SUBSTR('New York',-4)FROM dual; # York

Server:

-- Get last 4 characters in stringSELECTRIGHT('New York', 4); # York

You can also use RIGHT function if the absolute values of the negative start position and length are equal:

Oracle:

-- Get last 4 characters in stringSELECT SUBSTR('New York',-4, 4)FROM dual; # York

Server:

-- Get last 4 characters in stringSELECTRIGHT('New York', 4); # York

Resources

Oracle 11g R2 Language Reference

Microsoft Server 2012 - Books Online

SQLines Services

SQLines offers services to migrate Oracle databases and applications to Microsoft Server. For more information, please Contact Us.

Sours: https://www.sqlines.com/oracle/functions/substr
Oracle regular expression part 2 extracting substring regexp substr

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Sql developer substring

The Oracle function extracts a substring from a string with various flexible options.

Syntax

The following illustrates the syntax of the Oracle function:

Code language:SQL (Structured Query Language)(sql)

Arguments

The function accepts three arguments:

is the string that you want to extract the substring. The data type of can be , , , , , or .

is an integer that determines where the substring starts. The following explains the effect of the value:

  • If the is 0, the begin of the substring will be at the first character of the .
  • In case the is positive, the function will count from the beginning of the to determine the first character of the substring.
  • If the is negative, then the function will count backward from the end of the to find the first character of the substring.

determines the number of characters in the substring. If is omitted, the function returns all characters starting from the .

In case the is less than 1, the function returns null.

Return value

The function returns a substring from the starting at with the length.

Examples

Let’s see the following example:

Code language:SQL (Structured Query Language)(sql)
Oracle Substr - all arguments example

In this example, the function returns a substring whose length is 6 starting from the beginning of the main string.

The following statement returns the same substring as above but uses a negative value:

Code language:SQL (Structured Query Language)(sql)

Consider the following example:

Code language:SQL (Structured Query Language)(sql)
Oracle Substr - Optional Length

In this example, we omitted the third argument () therefore the function returned all characters starting from the 8th character of the main string.

See the following in the sample database:

Oracle SUBSTR Function - Employees Table

The following statement uses the and functions get employee names and their counts based on the initials.

Code language:SQL (Structured Query Language)(sql)
Oracle Substr Example

In this tutorial, you have learned how to use the Oracle function to extract a substring from a string.

Sours: https://www.oracletutorial.com/oracle-string-functions/oracle-substr/
Funciones Oracle Upper, Lower, Inicap, Lentgh, Substr, To char

MySQL SUBSTR() Function

❮ MySQL Functions

Example

Extract a substring from a string (start at position 5, extract 3 characters):

SELECT SUBSTR("SQL Tutorial", 5, 3) AS ExtractString;

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Definition and Usage

The SUBSTR() function extracts a substring from a string (starting at any position).

Note: The SUBSTR() and MID() functions equals to the SUBSTRING() function.

Syntax

SUBSTR(string, start, length)

OR:

SUBSTR(string FROM start FOR length)

Parameter Values

ParameterDescription
stringRequired. The string to extract from
startRequired. The start position. Can be both a positive or negative number. If it is a positive number, this function extracts from the beginning of the string. If it is a negative number, this function extracts from the end of the string
lengthOptional. The number of characters to extract. If omitted, the whole string will be returned (from the start position)

Technical Details


More Examples

Example

Extract a substring from the text in a column (start at position 2, extract 5 characters):

SELECT SUBSTR(CustomerName, 2, 5) AS ExtractString
FROM Customers;

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Example

Extract a substring from a string (start from the end, at position -5, extract 5 characters):

SELECT SUBSTR("SQL Tutorial", -5, 5) AS ExtractString;

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❮ MySQL Functions


Sours: https://www.w3schools.com/mysql/func_mysql_substr.asp

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