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PostgreSQL string functions
In PostgreSQL there are many different string functions designed for formatting, analyzing, and comparing strings.
These include both SQL92 standard functions and non-standard PostgreSQL extensions (such as Itrim(), rtrim() and substr()).
In PostgreSQL there are many different string functions
In general, everything that is said about the type of text equally applies to the values of character and varchar types.
| Function | Description |
| BTRIM | The PostgreSQL btrim function removes all specified characters both at the beginning and at the end of a line. |
| CHAR_LENGTH | The char_length function in PostgreSQL returns the length of the specified string. |
| CHARACTER_LENGTH | The character_length function in PostgreSQL returns the length of the specified string. |
| INITCAP | The function initcap PostgreSQL converts the first letter of each word to upper case, and all other letters are converted to lower case. |
| LENGTH | The length PostgreSQL function returns the length of the specified string, expressed in the number of characters. |
| LOWER | The lower PostgreSQL function converts all characters of a specified string into a lower case. |
| LPAD | The PostgreSQL lpad function returns a string added to the left side of the specified string of a certain length. |
| LTRIM | The ltrim PostgreSQL function removes all specified characters on the left side of the line. |
| POSTGRESQL operator || | PostgreSQL operator || allows combining 2 or more lines together. |
| POSITION | The PostgreSQL position function returns the substring location in a string. |
| REPEAT | The repeat PostgreSQL function repeats the string as many times as specified. |
| REPLACE | The replace PostgreSQL function replaces all occurrences of the specified string. |
| RPAD | The PostgreSQL rpad function returns a string added to the right side of the specified string of a certain length. |
| RTRIM | The PostgreSQL rtrim function removes all specified characters on the right side of the line. |
| STRPOS | The PostgreSQL strpos function returns the substring arrangement in a string. |
| SUBSTRING | The substring PostgreSQL function allows extracting substring from a string. |
| TRANSLATE | The translate PostgreSQL function replaces a sequence of characters in a string with another set of characters. However, it replaces one character at a time. For example, it replaces the first character in string_to_replace with the first character in replace_string. Then it will replace the second character in string_to_replace with the second character in replace_string, etc. |
| TRIM | The trim PostgreSQL function removes all specified characters from the beginning or end of a line. |
| UPPER | PostgreSQL function upper ctrreg converts all characters in the specified string into the upper case. |
Tutorial – String Functions
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