We can also use NOT Operator with PostgreSQL LIKE condition. The underscore sign (_) in the pattern is used to match any single character.The Search conditions can have either numbers or the literal characters: where the percent (%) sign matches any sequence of zero or more characters. To match a character or a sequence anywhere within a string, the pattern must start and end with a percentage (%) sign as the Like pattern matching always contains the entire string.It will return emp_fname as K aterine and K atrina. The above pattern _at% matches any string that should start with any single character (_), the literal string should follow the string at, the string should be ended with any number of characters. On executing the above command, we will get the following outcome: In the below example, the particular command will return those employees whose emp_fname contains "in" string such as Kather ine, Katr ina, Kar ina, etc. Note: In PostgreSQL, we can use the wildcards at the starting and ending of the pattern. This expression will return true because it matches any string, which starts with the letter a and followed by any number of characters. It will return true as the pattern ( _b_) matches any string, which starts with any single character, and followed by the letter b and finished with any single character. This expression will return false as the pattern (a_) matches any string that starts with the letter a, and is followed by any single character. It will return true as the abc pattern does not have any wildcard character hence the LIKE operator performs like the equal (=) operator. Let us see some examples of pattern matching by using the LIKE operator: 'abc' LIKE 'abc' And the 'Kat%' string is known as a pattern.Įxample of PostgreSQL Like operator: pattern matching.
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