9/25/2023 0 Comments Postgres round to 2 decimals![]() ![]() Myschema | round | numeric | double precision, int Myschema | round | double precision | double precision, text, int Schema | Name | Result data type | Argument data types PS: checking \df round after overloadings, will show something like, SELECT round(2.8+1/3.,'dec'::text) - need to cast string? pg bug ![]() complete!ĮLSE 'NaN'::float - like an error message To preserve the first commom-usage overload, we can return a FLOAT type when a TEXT parameter is offered, CREATE FUNCTION ROUND(float, text, int DEFAULT 0) Now your instruction will works fine, try (after function creation) SELECT round(1/3.,4) - 0.3333 numericīut it returns a NUMERIC type. You can overload the ROUND function with, CREATE FUNCTION ROUND(float,int) RETURNS NUMERIC AS $$ PS: another point about rounding is accuracy, check answer. There are a lack of overloads in some PostgreSQL functions, why (?): I think "it is a lack" (!), but and the PostgreSQL team agree about "pg's historic rationale". ![]() Try also the old syntax for casting, SELECT ROUND(AVG(some_column)::numeric,2) The FM prefix tells to_char that you don't want any padding with leading spaces. To_char will round numbers for you as part of formatting. Use to_char (see: data type formatting functions in the manual), which lets you specify a format and gives you a text result that isn't affected by whatever weirdness your client language might do with numeric values. If you're formatting for display to the user, don't use round. Just append ::numeric for the shorthand cast, like round(val::numeric,2). You must cast the value to be rounded to numeric to use the two-argument form of round. You can see that PostgreSQL is expanding it in the output). (In the above, note that float8 is just a shorthand alias for double precision. Regress=> SELECT round( CAST(float8 '3.1415927' as numeric), 2) Pg_catalog | round | numeric | numeric, integer | normal Pg_catalog | round | numeric | numeric | normal Pg_catalog | round | double precision | double precision | normal Pg_catalog | dround | double precision | double precision | normal Schema | Name | Result data type | Argument data types | Type regress=> SELECT round( float8 '3.1415927', 2 ) ĮRROR: function round(double precision, integer) does not exist For reasons Sherrill 'Cat Recall' explains in the comments, the version of round that takes a precision is only available for numeric. PostgreSQL does not define round(double precision, integer). ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |