Need some clarification on decode (AND)

The example that I am referring to comes from DECODE

ORDER_ID CUSTOMER_ID ORDER_STATUS LOCATION RECOGNITION METHOD

2458 101 0.00 postOffice certified Air

2397 102 1.00 warehouse Air certified

2454 103 1.00 warehouse Air certified

2354 104 0.00 postOffice certified Air

2358 105 2.00 ground postOffice certified

2381 106 3.00 ground warehouse certified

2440 107 3.00 ground warehouse certified

2357 108 5.00 warehouse Air assured

2394 109 5.00 warehouse Air assured

2435 144 6,00 secured to the floor of the post office

Assumes that the value of order_status is used in the form of bitmap where the first three bits contain information about the order and the other bits are always 0:

  • The first bit is used for location data:
    • 0 = Post Office. This corresponds to the values of 0, 2, 4 and 6.
    • 1 = the warehouse. This corresponds to the values of 1, 3, 5 and 7.
  • The second bit is used for the method:
    • 0 = air. This corresponds to the values of 0, 1, 4 and 5.
    • 1 = mass. This corresponds to values of 2, 3, 6 and 7.
  • The third bit is used for reception
    • 0 = certified. This corresponds to the values of 0, 1, 2 and 3.
    • 1 = insured. This corresponds to the values of 4, 5, 6 and 7.

DECODE (BITAND (order_status, 1), 1, 'Warehouse', 'Post office').  DECODE (BITAND (order_status, 2), 2, 'on the ground', 'Plane'): DECODE (BITAND (order_status, 4), 4, 'Assured', 'Certified')

Please explain how know what value to use for the second parameter of the function bitand above? I have seen a few examples up bitand (column 64), bitand (column, 128), bitand (column, 256)

What to do when you have more than 50 different status values? must we first arrive at a setting the time for each of the 50 state values?



DECODE (BITAND (order_status, 1), 1, 'Warehouse', 'Post office').  DECODE (BITAND (order_status, 2), 2, 'on the ground', 'Plane'). DECODE (BITAND (order_status, 4), 4, "Insured", "Certified")

Please explain how know what value to use for the second parameter of the function bitand above? I have seen a few examples up bitand (column 64), bitand (column, 128), bitand (column, 256)

You already have a reference to the answer in your own message:

  • The first bit is used for location data:

    • 0 = Post Office. This corresponds to the values of 0, 2, 4 and 6.
    • 1 = the warehouse. This corresponds to the values of 1, 3, 5 and 7.
  • The second bit is used for the method:
    • 0 = air. This corresponds to the values of 0, 1, 4 and 5.
    • 1 = mass. This corresponds to values of 2, 3, 6 and 7.
  • The third bit is used for reception
    • 0 = certified. This corresponds to the values of 0, 1, 2 and 3.
    • 1 = insured. This corresponds to the values of 4, 5, 6 and 7.

Bits are binary. The 'first bit' is the wick at the right. The rightmost bit, once defined, type has a value of 2 ^ 0 or '1', that's what you use as the second parameter.

The 'second bit' ((deuxieme right), once defined, has a value of 2 ^ 1 or '2' (in binary) If you use '2'.

The 'third bit', once defined, has a value of 2 ^ 2 which is the "4" for you to use 4.

The 'nth bit' has a value of 2 ^(n-1) - so the 5th-bit value is 2 ^ 4 which is 16 so you would use 16.

What to do when you have more than 50 different status values? must we first arrive at a setting the time for each of the 50 state values?

Yep! This small 50th has a value of 2 ^ 49-online 562949953421312

"Warehouse AND on the ground" would be the TWO bits 1 and 2 which is binary 3.

So, if you come to BITAND (order_status, 3):

1. If the est0 or bit value is defined is Post Office AND Air.

2. If the value is 3 the two bits are set is warehouse AND field

You dig a hole for yourself using missions like yours since each bit is used for many things. For example the first bit means, post office and warehouse, depending on whether the bit is defined or not.,.

But what happens if you have three or more 'locations?

  • The first bit is used for location data:

  • 0 = Post Office. This corresponds to the values of 0, 2, 4 and 6.
  • 1 = the warehouse. This corresponds to the values of 1, 3, 5 and 7.
  • The second bit is used for the method:
    • 0 = air. This corresponds to the values of 0, 1, 4 and 5.
    • 1 = mass. This corresponds to values of 2, 3, 6 and 7.
  • The third bit is used for reception
    • 0 = certified. This corresponds to the values of 0, 1, 2 and 3.
    • 1 = insured. This corresponds to the values of 4, 5, 6 and 7.
  • That makes no sense at all. How can 'Air' correspond to a value of "4", if this value means "Post Office" and "insured"?

    You do not want to mix raw values like this.

    And it is rarely necessary or enjoy combining several attributes to a single value. A best practice is that each value represents an attribute:

    1 location

    Bit 1 - Post office

    Bit 2 - warehouse

    Bit 3 - Garage

    Bit 4-...

    2. method

    Bit 1 - Air

    Bit 2 - ground

    . . .

    But the better question is why is of type bit mapping used at all?

    I you LOVE bitmapping and it is extremely powerful when used in a case of correct use. Your use case does not seem appropriate.

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