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With SQL, I would like to detect if a certain bit is on with an integer column type (MySQL)?
How would I go about this?
Basically, I want to detect if a bit is on, if it is on, then ignore.
I am using something like this now:
WHERE (column & 2) != 2
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You can use the CONVERT operator. CAST or CONVERT will work. Show activity on this post. 1 is the display for a true bit.
SQL Server bit data type is an integer data type that can take only one of these values: 0, 1, NULL. With regard to the storage, if there are less than 9 columns of the bit data in the table, they are stored as 1 byte. If there are 9 to 16 such columns, they consume 2 bytes and so on.
Syntax to check if the value is an integer. select yourColumnName from yourTableName where yourColumnName REGEXP '^-?[0-9]+$'; The query wherein we have used regular expression. This will output only the integer value.
We can use the CAST method to cast from one data type to another. You might want to cast a float value to int value for that we use CAST(). So in case three is based on the condition we are casting int 1 to BIT which returns True value and int 0 to BIT which returns False value.
Say you're checking for the 3rd bit then...
SELECT bits & 8 = 8 FROM table;
This returns a binary (1 or 0) for whether the bit in question (in this case the third) is on or off for each row in the column 'bits'.
using 2^x for the xth bit instead of 8.
for example, to check the 5th bit we would use 2^5 = 32
SELECT bits & 32 = 32 FROM table;
However, this is needlessly complicated. Simply use boolean values in several columns and it will make things much easier.
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