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uuid, 16, 3 ) INNER JOIN uuid\_conv AS block\_g ON block\_g. uuid, 13, 3 ) INNER JOIN uuid\_conv AS block\_f ON block\_f. uuid, 10, 3 ) INNER JOIN uuid\_conv AS block\_e ON block\_e. uuid, 7, 3 ) INNER JOIN uuid\_conv AS block\_d ON block\_d. uuid, 4, 3 ) INNER JOIN uuid\_conv AS block\_c ON block\_c. uuid, 1, 3 ) INNER JOIN uuid\_conv AS block\_b ON block\_b. INNER JOIN uuid\_conv AS block\_a ON block\_a.
#UUID GENERATOR SEED MOD#
In the SAP implementation there is a small modification called Pseudo Base 64: The sequence of characters is slightly different and the special characters ', MOD (generated\_period\_start, 64 ) + 1, 1 ) as c22įROM series\_generate\_integer ( 1, 0, 4095 ) DO BEGIN According to RFC 4648, these are the 10 digits 0 to 9, the 26 lowercase letters a to z, the 26 uppercase letters A to Z, and the special characters / and +. The difference to Base 16 is that now 64 instead of 16 different characters are used. This brings us to the next coding: C22 - The bytes are encoded with the Base 64 Encoding Since the representation of C32 and C36 is relatively long, there is the idea to use a larger alphabet and thus generate shorter codes. The only difference between C32 and C36 is that the characters are grouped in blocks. You can find this representation very often for the display of binary data. The alphabet for these 16 different values consists of the digits 0 to 9 and the letters A to F. This is very intuitive, because one byte with 8 bits becomes exactly two values with 4 bits each. The conversion of one byte into two hexadecimal values is described in RFC 4648. When it comes to editing them as a string, the X16 is normally represented in 32 hexadecimal values. However, they are quite difficult to be interpreted by humans. These data types are the best in storing the 16 bytes. This corresponds in ABAP to the built-in, byte-type data type x. In SAP HANA, the data type for bytes is called VARBINARY. Basically, all formats are about to represent 16 bytes in different ways. In the following we designate these formats according to the convention used by SAP for the signature of the ABAP class CL_SYSTEM_UUID. There are several common formats for UUID in SAP systems, each of them can be converted into all the other ones. No one can remember a UUID and even comparing two UUIDs is tedious if they are not written exactly beneath each other. The price for this unambiguity, however, is a format that is a real challenge for human readers. This makes it possible to merge data sets from totaly different computer systems without the risk of key collision. In other words, the fact that a UUID generated on the basis of the specifications in fact does not exist twice. The huge advantage is the uniqueness of a UUID. The so-called Universally Unique Identifiers (UUID) or Globally Unique Identifiers (GUID) are often used as keys for the unique identification of information. This deals with the question, how a JOIN between the different UUID formats is possible. The starting point and reason for this article is a question from the SAP community. In SAP HANA, however, the conversion is not so simple. There is a special class for converting these different formats in the ABAP world. But there are different formats for UUID. The prerequisite for this is a uniform data type. As long as these do not have to be interpreted or converted, this is not a problem for SAP HANA. Uuid := strings.Replace(uuidWithHyphen.You will often encounter GUID and UUID in SAP HANA and in S/4HANA as key fields. Uuid := strings.Replace(uuidWithHyphen.String(), "-", "", -1) Let’s see two libraries which can be used to generate UUID There are different libraries available for generating the UUID. So there are a total of 36 characters which include 32 hexadecimal and 4 hyphens. UUID is represented as 32 hexadecimal digits(Base 16) displayed in 5 parts separated by hyphens.UUID doesn’t depend upon any central server for their generation.00000006 chance that two UUID will be the same in case you were to generate 10 trillion UUID UUID is likely to be different from any other UUID generated.It is meant to uniquely identify something. UUID also known as GUID is a 16 byte or 128-bit number.