Takes n bit arrays and returns a bitwise AND-ing of its arguments using the following logic: for each bit compared, if all bits are 1, return 1; otherwise, return 0.
BIT_AND( bit-expression )
expression The expression for which the value is to be determined. This is commonly a column name.
SQL/2003 Vendor extension.
Suppose you have the following table, t, containing a single column, a, which is a VARBIT data type.
You want to know the AND value for the column. You enter the following SELECT statement, which returns 0000:
SELECT BIT_AND( a ) FROM t;
This result is determined as follows:
Row 1 (0001) is compared with Row 2 (0111), and results in 0001 (both values had a 1 in the fourth bit).
The result from the previous comparison (0001) is compared with Row 3 (0100), and results in 0000 (neither value had a 1 in the same bit).
The result from the previous comparison (0000) is compared with Row 4 (0011), and results in 0000 (neither value had a 1 in the same bit).