In PostgreSQL, we can use the quote_literal() function to quote strings within a SQL statement string.
Any embedded single-quotes and backslashes are properly doubled.
Continue readingTag: functions
How the QUOTE_NULLABLE() Function Works in PostgreSQL
In PostgreSQL, the quote_nullable() function returns a given string suitably quoted to be used as a string literal in a SQL statement string. It returns the actual string NULL if the argument is null.
Any embedded single-quotes and backslashes are properly doubled.
Continue readingA Quick Look at the OVERLAY() Function in PostgreSQL
In PostgreSQL, we can use the overlay() function to replace a substring within a string. The function allows us to be very specific with regards to where in the string to start the operation and how much of it should be replaced.
Difference Between ARRAY_POSITIONS() and ARRAY_POSITION() in PostgreSQL
PostgreSQL has a couple of functions that enable us to get the position or positions of a given value in an array. One of them – array_position() – returns the position of just the first occurrence (as an integer), while the other function – array_positions() – returns the position of all occurrences (as an array).
So these functions are aptly named – one is singular and the other is plural.
But this isn’t the only difference. The array_position() function allows us to specify a start position, while array_positions() doesn’t.
Using LTRIM() in PostgreSQL
In PostgreSQL, the ltrim() function trims the left side of a string. We can trim blank spaces or we can specify certain characters to trim.
It removes the longest string containing only characters from the ones we specify. If we don’t specify any characters, then it removes blank spaces.
Continue readingUnderstanding RTRIM() in PostgreSQL
In PostgreSQL, we can use the rtrim() function to trim the right side of a string. We can trim blank spaces or we can specify certain characters to trim.
It removes the longest string containing only characters from the ones we specify. If we don’t specify any characters, then it removes blank spaces.
Continue readingA Quick Look at the TRIM() Function in PostgreSQL
In PostgreSQL, the trim() function can be used to trim both sides, or a specified side, of a string. We can trim blank spaces or we can specify certain characters to trim.
It removes the longest string containing only characters from the ones we specify. If we don’t specify any characters, then it removes blank spaces.
Continue readingLet’s Look at PostgreSQL’s ARRAY_REMOVE() Function
We can use the array_remove() function in PostgreSQL to remove elements from an array.
We pass two arguments when calling the function; the first is the array and the second argument is the element to remove. All occurrences of the specified element are removed.
The function returns an identical array, but without the specified element/s.
Continue readingUnderstanding OCTET_LENGTH() in PostgreSQL
In PostgreSQL, the octet_length() function returns the number of bytes in a given string. We pass the string as an argument and the function returns the number of bytes in that string.
A Quick Look at the BIT_LENGTH() Function in PostgreSQL
PostgreSQL has a bit_length() function that returns the number of bits in a given string. We pass the string as an argument and the function returns the number of bits in that string.