BIN_TO_NUM
converts a bit vector to its equivalent number. Each argument to this function represents a bit in the bit vector. This function takes as arguments any numeric data type, or any nonnumeric data type that can be implicitly converted to NUMBER
. Each expr
must evaluate to 0 or 1. This function returns Oracle NUMBER
.
BIN_TO_NUM
is useful in data warehousing applications for selecting groups of interest from a materialized view using grouping sets.
See Also:
group_by_clause for information on GROUPING
SETS
syntax
Table 2-10, "Implicit Type Conversion Matrix" for more information on implicit conversion
Oracle Database Data Warehousing Guide for information on data aggregation in general
The following example converts a binary value to a number:
SELECT BIN_TO_NUM(1,0,1,0) FROM DUAL; BIN_TO_NUM(1,0,1,0) ------------------- 10
The next example converts three values into a single binary value and uses BIN_TO_NUM
to convert that binary into a number. The example uses a PL/SQL declaration to specify the original values. These would normally be derived from actual data sources.
SELECT order_status FROM orders WHERE order_id = 2441; ORDER_STATUS ------------ 5 DECLARE warehouse NUMBER := 1; ground NUMBER := 1; insured NUMBER := 1; result NUMBER; BEGIN SELECT BIN_TO_NUM(warehouse, ground, insured) INTO result FROM DUAL; UPDATE orders SET order_status = result WHERE order_id = 2441; END; / PL/SQL procedure successfully completed. SELECT order_status FROM orders WHERE order_id = 2441; ORDER_STATUS ------------ 7
Refer to the examples for BITAND for information on reversing this process by extracting multiple values from a single column value.