If you’re getting a PostgreSQL error that reads “op ANY/ALL (array) requires array on right side” it’s probably because you’re passing a non array to the ANY() or ALL() construct.
These constructs require an array to be included in the parentheses, and so passing a non array returns an error.
To fix this issue, be sure to pass an array when using these functions.
Continue readingIf you’re getting an error that reads ‘date field value out of range‘ in PostgreSQL while using the make_date() function, it’s probably because one or more of the date parts you’re providing is out of range for that date part.
It’s possible that you’ve got the month and day in the wrong order.
To fix this issue, be sure that each date part you provide is within the valid range for that date part. It may be that all you need to do is switch the day and the month around.
Continue readingBy default, PostgreSQL arrays are one-based. That means that the numbering starts at subscript 1 and increments with each element in the array. However, we can change this so that the array starts at a different subscript.
Continue readingIf you’re getting a PostgreSQL error that reads “function generate_subscripts(numeric, integer) does not exist“, it’s probably because your first argument is not an array. This specific error message implies that the first argument is a numeric value, but we’d get a similar error when passing an integer.
The first argument for this function must be an array.
To fix this error, be sure that your first argument to generate_subscripts() is an array.
If you’re getting a PostgreSQL error that reads “searching for elements in multidimensional arrays is not supported“, it’s probably because you’re trying to perform an operation against a multi dimensional array when that operation only supports one dimensional arrays.
To fix this issue, perform the operation against a one dimensional array instead. You may be able to do this by applying the unnest() function against the multi dimensional array.
In PostgreSQL, we have many ways to retrieve data from arrays. One way is to specifically reference its subscript or a range of subscripts. Another way is to search through the array’s contents for the value we want.
By doing a search, I mean we could do things like filter the query with a WHERE clause, so that we only return rows that contain an array that has an element with a certain value.
If you’re getting an error that reads “could not determine polymorphic type because input has type unknown” when using the array_shuffle() function in PostgreSQL, it’s probably because your argument is of the wrong type.
The array_shuffle() function requires an array as its argument. Passing a non-array value will result in an error. The actual error can vary, depending on the argument you pass, but either way, the error is usually due to a non-array argument being passed.
To fix this error, be sure to pass an array as the argument when calling the array_shuffle() function.
If you’re getting an error that reads “multidimensional arrays must have array expressions with matching dimensions” it’s probably because you’re trying to create a multi-dimensional array where the inner arrays at the same level have different dimensions.
Multidimensional arrays must be rectangular. To fix this issue, make sure all arrays at the same level have the same dimensions.
Continue readingIn PostgreSQL, the array_length() function returns the length of the specified array dimension.
We pass the array as the first argument, and the dimension as the second.
Continue readingPostgreSQL has a datestyle variable that specifies the display format for date and time values, as well as the rules for interpreting ambiguous date input values.Â
We can set the date/time style with the SET datestyle command, the DateStyle parameter in the postgresql.conf configuration file, or the PGDATESTYLE environment variable on the server or client.
Below is an example of using the SET datestyle command to change the datestyle for the current session.