What does CONVERT(INT, N_TYPE)&128 do?

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I'm currently working through several SQL Functions someone else did and i am getting results i'm not able to explain.

The broken down part looks like this:

SELECT
   N_TYPE,
   CONVERT(INT, N_TYPE)&128,
   CONVERT(INT, N_TYPE)&64
FROM TBL_EXAMPLE

N_TYPE is a decimal(10,0) field. Some Examples of what i get returned:

+-----------+-------------+------------+
|  N_TYPE   | CONVERT 128 | CONVERT 64 |
+-----------+-------------+------------+
|         0 |           0 |          0 |
|       200 |         128 |         64 |
|       136 |         128 |          0 |
|        32 |           0 |          0 |
| 536870912 |           0 |          0 |
|        72 |           0 |         64 |
+-----------+-------------+------------+

I thought it returned 64 or 128 respectively, if N_TYPE Is above those values, but this isn't the case (as seen above at N_TYPE=136, where 64 is not returned).

So, what does this actually do?

The first part is converting the N_TYPE column to an int. The second part is using the & operator which is the a bitwise AND operator.

So if you apply x & 64, you will get a value of 0 if the 7th binary digit from the right is not set, or 64 if that digit is set to 1.

What does CONVERT(INT, N_TYPE)&128 do?, The first part is converting the N_TYPE column to an int . The second part is using the & operator which is the a bitwise AND operator. So if you� Strings in PHP can be converted to numbers (float / int / double) very easily. In most use cases, it won’t be required since PHP does implicit type conversion. There are many methods to convert string into number in PHP some of them are discussed below: Method 1: Using number_format() Function. The number_format() function is used to convert

The ampersand (&) in SQL Server is the bit-wise operator for AND, and the way that's used on your example is to determine that the bits that compose the integer values 128 and 64 should also match in position with the bits that compose the value on the left side (the result of CONVERT(INT, N_TYPE)).

Check these examples:

Position    8   7   6   5   4   3   2   1
Result                              
0           0   0   0   0   0   0   0   0
1           0   0   0   0   0   0   0   1
2           0   0   0   0   0   0   1   0
4           0   0   0   0   0   1   0   0
8           0   0   0   0   1   0   0   0
16          0   0   0   1   0   0   0   0
32          0   0   1   0   0   0   0   0
64          0   1   0   0   0   0   0   0
72          0   1   0   0   1   0   0   0
128         1   0   0   0   0   0   0   0
136         1   0   0   0   1   0   0   0
200         1   1   0   0   1   0   0   0

You will see that 200 & 128 will return (bit-wise) 10000000 which are bits that both have 1 (the AND works this way), and that converts back to 128 as INT.

Another example 136 & 8 will return 00001000 which converts back as 8.

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In your case & is is a bitwise operator used for bit manipulations between two expressions.

For example

 select 200&128

Will be calculated as

    200      11001000   
&   128      10000000
---------   ---------   
=   128      10000000

Similarly

select 31&128

will be calculated as

    31      00011111    
&   128     10000000    
---------   --------
=   0       00000000    

You can read more about Bitwise operator Bitwise Operators (Transact-SQL)

Int#(n), The Int#(n) type is a signed fixed width representation of an integer value, where n Bluespec provides a set of functions to convert a type between Bit#(n) and� Casting refers to the conversion of a particular variable’s data type to another data type. For example, if there is a string “1234” and after converting it to int data type the output will be an integer 1234. Conversion of string to integer in Perl has many ways.

Casting and type conversions, int i; // error CS0029: Cannot implicitly convert type 'string' to 'int' i For built-in numeric types, an implicit conversion can be made when the� Actually, what Convert::Binary::C does is not very different from what a C compiler does, just that it doesn't compile the source code into an object file or executable, but only parses the code and allows Perl to use the enumerations, structs, unions and typedefs that have been defined within your C source for binary data conversion, similar

Type Conversion, Converts an input value to the Int data type. This function family The behavior of functions for the NaN and Inf arguments is undefined. Converts a String type argument to a FixedString(N) type (a string with fixed length N). The CONVERT function is used to convert from a value from one data type to another with formatting. It is specific to SQL Server and not an ANSI SQL-92 compliant function. The syntax for the function is. CONVERT(datatype, value, style) where. datatype is the type you which to convert the value to; value is the item you wish to convert

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Comments
  • & is the bitwise AND operator.
  • It's a bitwise AND
  • It demonstrates that you can violate all normal forms and cram multiple data items into a single column's value.