2 Articles tagged “Text”

Continuing our series of PostgreSQL Data Types today we’re going to introduce some of the PostgreSQL text processing functions.

There’s a very rich set of PostgreSQL functions to process text — you can find them all in the string functions and operators documentation chapter — with functions such as overlay(), substring(), position() or trim(). Or aggregates such as string_agg(). There are also regular expression functions, including the very powerful regexp_split_to_table(). In this article we see practical example putting them in practice.

Continuing our series of PostgreSQL Data Types today we’re going to introduce the PostgreSQL text data type. The first notion to understand when processing text in any program is of course the notion of encoding.

So when addressing the text datatype we must mention encoding settings, and possibly also issues. An encoding is a particular representation of characters in bits and bytes. In the ASCII encoding the letter A is encoded as the 7-bits byte 1000001, or 65 in decimal, or 41 in hexadecimal. All those numbers are going to be written the same way on-disk, and the letter A too.