Postgres Float to Int - SQL

When working with PostgreSQL, one common task is to convert a float value to an int. This can be useful in cases where you want to do calculations with integers or when you need to store the value as an integer in the database.

Method 1: Using CAST

One way to convert a float to an int is to use the CAST function. This function can convert a value of one data type to another. Here's an example:

SELECT CAST(12.345 AS INTEGER);

In this case, the output would be 12.

It's important to note that the CAST function rounds the float value down to the nearest integer.

Method 2: Using ::

Another way to convert a float to an int is to use the double colon (::) operator. Here's an example:

SELECT 12.345::INTEGER;

In this case, the output would also be 12.

Method 3: Using the FLOOR Function

If you want to round the float value down to the nearest integer, you can use the FLOOR function. Here's an example:

SELECT FLOOR(12.345);

In this case, the output would be 12.

Method 4: Using the CEILING Function

If you want to round the float value up to the nearest integer, you can use the CEILING function. Here's an example:

SELECT CEILING(12.345);

In this case, the output would be 13.

Conclusion

There are several methods for converting a float to an int in PostgreSQL. The method you choose will depend on what you want to do with the value and how you want it to be rounded. Use the CAST function or double colon operator for simple conversion, or use the FLOOR or CEILING function for rounding.

Remember to test your code thoroughly to make sure it works as expected.