Using the TONUMBER(), CAST(), and :: operator, we can convert a string into a numeric type such as an integer, double, or decimal. Postgres=# select (extract('epoch' from now()) - extract('epoch' from timestamp ''))/3600.0/24. In PostgreSQL, the :: operator and CAST operator are used for converting/casting one type to another. postgres=# select extract('epoch' from now()) - extract('epoch' from timestamp '') In PostgreSQL strings can be converted to integer or double using CAST function or the :: annotation. In our example, we converted the string 5800.79 to 5800.79 (a. Correct: After the time is converted to epoch time, the two epoch values subtract again. Use the :: operator to convert strings containing numeric values to the DECIMAL data type. Such an algorithm causes the result to be inconsistent with the expectation.Ģ. The integer is multiplied by this level and converted into the constant coefficient of the lower level.ĭoes the epoch of 0.584 years equal 210 days? postgres=# select 0.584*12 Īfter erasing the decimals, you get six months or seven months. If it is not an integer, it needs to be converted into a lower-level integer. Mins * ((int64) SECS_PER_MINUTE * USECS_PER_SEC) +Įach unit is an integer. Result->time = hours * ((int64) SECS_PER_HOUR * USECS_PER_SEC) + Result->month = years * MONTHS_PER_YEAR + months Result = (Interval *) palloc(sizeof(Interval)) (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE), Here you use row expressions casted to the table's type, and then extracting them back to a table. FROM (VALUES ( (TRUE, NULL, 1234)::fields)) t (x) active core id t 1234. * inputs as well, but it's not entirely clear what limits to apply. From your example, a small trick could possibly help: SELECT (x). * make_interval - numeric Interval constructor Postgres=# select extract('epoch' from interval '0.584 year')/3600/24.0 ĭoes the epoch of one year equal 365.25 days?ĭoes the epoch of 0.5 years equal 180 days?ĭoes the epoch of 0.583 years equal 180 days?ĭoes the epoch of 0.584 years equal 210 days? Postgres=# select extract('epoch' from interval '0.5 year')/3600/24.0

PostgreSQL does implicit type conversion, for example, if you try to perform a mathematical operation on one numeric value and another text datatype with a numeric value. Postgres=# select extract('epoch' from interval '1 year')/3600/24.0 CAST Operator The CAST operator can be applied to an expression that evaluates to some value or table column also. When interval type is converted to epoch, the algorithm may not match the expected one: postgres=# select extract('epoch' from interval '0.01 year')/3600/24.0 The TONUMBER() function requires two arguments.

The syntax of PostgreSQL TONUMBER() function is as follows: TONUMBER(string, format) Arguments. Error: Time subtraction and conversion to the epoch (seconds) The PostgreSQL TONUMBER() function converts a character string to a numeric value. This function computes the interval between two timestamps and converts the result to a value in seconds or days.ġ.

Postgresql cast numeric