PostgreSQL provides us with a few functions that we can use to convert strings between uppercase and lowercase.
We can convert the whole string to uppercase or lowercase, or we can convert it to initial caps, where the first letter of each word is uppercase and the rest of the word is lowercase.
Continue readingPostgreSQL provides us with various string functions, including some that allow us to trim a given string on both sides or a given side.
Below are four functions that we can use to trim strings in PostgreSQL.
Continue readingIn PostgreSQL, the md5() function computes the MD5 hash of the specific text, and outputs the result in hexadecimal.
We pass the text as an argument when calling the function.
Continue readingPostgreSQL sometimes provides us with multiple functions that basically do the same thing. Such is the case with the following two functions that return the position of a given substring within a string.
Continue readingIn PostgreSQL, we can use the to_hex() function to convert a number to its equivalent hexadecimal representation.
The function accepts the number as an integer or bigint, and it returns the result as a text representation of its hexadecimal equivalent.
Continue readingIn PostgreSQL, we can use the ascii() function to get the numeric code of the first character of the argument.
When using UTF8, the function returns the Unicode code point of the character. Other multibyte encodings require an ASCII character.
Continue readingThe PostgreSQL split_part() function splits a string based on a specified delimiter and then returns the specified part from the split string.
The function accepts three arguments; the string, the delimiter, and the part that we want to return.
Continue readingIn PostgreSQL, we can use the pg_client_encoding() function to get the current client encoding name.
In PostgreSQL the right() function returns the specified number of rightmost characters in a given string.
We have the option of specifying the number of characters to return from the right or the number of characters to omit from the left. We do this by specifying a positive integer (to return n number of rightmost characters) or a negative integer (to return everything except n leftmost characters).
Continue readingIn PostgreSQL we can use the left() function to get the specified number of leftmost characters in a given string.
We have the option of specifying the number of characters to return from the left or the number of characters to omit from the right. We do this by specifying a positive integer (to return n number of leftmost characters) or a negative integer (to return everything except n rightmost characters).
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