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PostgreSQL - NOT ILIKE Operator



The PostgreSQL NOT ILIKE operator is the negation of ILIKE operator. The ILIKE operator is used in a WHERE clause to search for a specified pattern in a specified column. The wildcards which are used in conjunction with the ILIKE or NOT ILIKE operator are given below:

Note: The ILIKE operator is similar to LIKE operator except the ILIKE operator performs case-insensitive match according to the active locale and LIKE operator performs case-sensitive match according to the active locale.

Wildcard Characters in PostgreSQL

SymbolDescriptionExample
%Represents zero, one or multiple characters.'J%' represents a value that start with "J", for example - John, Jo and Jack etc.
_Represents one character.'_o%' represents a value that have "o" in the second position, for example - John, Jo and Journey etc.
ESCAPEAllow test for literal instances of a wildcard character such as % or _'J%!%' ESCAPE '!' represents a value that starts with J and ends in %, for example - John%, Jo% and Journey% etc.

Note: The operator ~~* is equivalent to ILIKE. Similarly, !~~* operator represents NOT ILIKE.

Syntax

The syntax for using ILIKE and NOT ILIKE operators in PostgreSQL are given below:

/* Using ILIKE operator */
SELECT column1, column2, ...
FROM table_name
WHERE column ILIKE pattern;

/* Using NOT ILIKE operator */
SELECT column1, column2, ...
FROM table_name
WHERE column NOT ILIKE pattern;

The table below describes patterns which is used with ILIKE operator and uses (%) and (_).

PatternDescription
'J%'A value that start with "J".
'%n'A value that end with "n".
'%oh%'A value that have "oh" in any position.
'_o%'A value that have "o" in the second position.
'J_%'A value that start with "J" and have at least 2 characters.
'J__%'A value that start with "J" and have at least 3 characters.
'J%n'A value that start with "J" and ends with "n".

Example:

Consider a database containing a table called Employee with the following records:

EmpIDNameCityAgeSalary
1JohnLondon253000
2MarryNew York242750
3JoParis272800
4KimAmsterdam303100
5RameshNew Delhi283000
6HuangBeijing282800

  • Using the % Wildcard : To select all records of the Employee table with Name starting with 'Jo', the query is given below.

    SELECT * FROM Employee
    WHERE Name ILIKE 'Jo%';
    

    This will produce the result as shown below:

    EmpIDNameCityAgeSalary
    1JohnLondon253000
    3JoParis272800
  • Using the % Wildcard with NOT ILIKE operator: NOT ILIKE operator is used as the negation of ILIKE operator. For example, to select all records of the Employee table with Name not starting with 'Jo', the following query can be used:

    SELECT * FROM Employee
    WHERE Name NOT ILIKE 'Jo%';
    

    This will produce the result as shown below:

    EmpIDNameCityAgeSalary
    2MarryNew York242750
    4KimAmsterdam303100
    5RameshNew Delhi283000
    6HuangBeijing282800
  • Using the _ Wildcard : To select all records of the Employee table with Name containing 'o' as second character, the query is mentioned below.

    SELECT * FROM Employee
    WHERE Name ILIKE '_o%';
    

    The result of the above code will be:

    EmpIDNameCityAgeSalary
    1JohnLondon253000
    3JoParis272800
  • Using the _ Wildcard with NOT ILIKE operator: To select all records of the Employee table with Name not containing 'o' as second character, the query is given below:.

    SELECT * FROM Employee
    WHERE Name NOT ILIKE '_o%';
    

    The result of the above code will be:

    EmpIDNameCityAgeSalary
    2MarryNew York242750
    4KimAmsterdam303100
    5RameshNew Delhi283000
    6HuangBeijing282800

❮ PostgreSQL - Operators