In PostgreSQL, we can use the chr() function to return a character based on its code.

The code is provided as an integer argument, and the function returns the character that the code represents. When using UTF8 encoding the argument is treated as a Unicode code point, otherwise it must designate an ASCII character.

PostgreSQL has a unistr() function that evaluates escaped Unicode characters in its argument and returns the result as text.

PostgreSQL has a translate() function which replaces certain characters in a string with certain other characters.

We specify the characters in the string that we want to replace, as well as the characters that we want to replace them with. The function then performs the translation and returns the string with the replaced characters.

In PostgreSQL, we can use the to_ascii() function to convert a string to ASCII from another encoding. This usually involves dropping any accents (diacritic signs) from the original string.

We pass the string as an argument to the function. We also have the option of specifying the encoding (either its name or its number).

We can use PostgreSQL’s repeat() function to repeat a string multiple times. We pass the string to the function, along with an integer that specifies how many times we want it repeated, and it returns the string repeated that many times.