:power is a variable that can be given any value using java code. Error: ERROR: invalid input syntax for type numeric: 'null'. Exact numeric (SMALLINT, INTEGER, BIGINT, DECIMAL, NUMERIC) Approximate numeric (FLOAT, REAL, DOUBLE PRECISION) string. INSERT into someTable (name,created,power) SELECT 'xyz',now (), case when :power 'null' then NULL else cast (:power as numeric) end from abc. SET lcmonetary 'enGB' SELECT CAST (SUM (cost) AS MONEY) AS Total FROM orders As mentioned in the locale docs you can get a list of available locales on a Unix system by running locale -a. You can do this by setting a value for lcmonetary. (The latter is preferable to avoid risking precision loss.) When a money value is divided by another money value, the result is double precision (i.e., a pure number, not money) the currency units cancel each other out in the division. This is actually part of an insert statement. You need to set your currency locale to be pounds instead of dollars. When converting from double precision, it is quite similar to rounding off the expression. In case of processor memory, the double precision types can occupy up to 64 bit of memory. Double precision expression takes more decimal points when compared to float data types. To get a rounded result, divide by a floating-point value, or cast the money value to numeric before dividing and back to money afterwards. Postgresql cast double precision to numeric. The syntax of the CAST operator’s another version is as follows as well: Syntax. The target data type is the data type to which the expression will get converted. SELECT '52093.89'::money::numeric::float8 ĭivision of a money value by an integer value is performed with truncation of the fractional part towards zero. How does the CAST Operator work in PostgreSQL The cast operator converts one data type to another, where the table column or an expression’s data type is decided to be. Conversion to other types could potentially lose precision, and must also be done in two stages: Floating point numbers should not be used to handle money due to the potential for rounding errors.Ī money value can be cast to numeric without loss of precision. Conversion from the real and double precision data types can be done by casting to numeric first, for example: Values of the numeric, int, and bigint data types can be cast to money. To avoid problems, before restoring a dump into a new database make sure lc_monetary has the same or equivalent value as in the database that was dumped. For example: postgres SELECT (15/7)::decimal(10,2) numeric - 2. Since the output of this data type is locale-sensitive, it might not work to load money data into a database that has a different setting of lc_monetary. Note that you will have to cast one of the values in the expression as decimal, otherwise it will treat both as int, and the division will result in an integer, so casting to a decimal after that won't be accurate.
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