If you're interested in previous discussions, look into #350 Store binary UUID in MySQL and #645 Add support for optimized binary UUID keys. Why Every 4 bits of the UUID represented is hex therefore that hex character is 8 bits of storage. If it's important to you to store uuids in a natively uuid-ish way, switch to a data storage that supports it (postgresql comes to mind.) The problem here is that mysql, 2019, still don't have an uuid data type. So, this suggestion would basically break existing non-mysql systems that has a proper uuid type, while forcing everyone into a binary format they need different sql functions to work with. The only way to support this on databases without the proper data type is to store them as something that work identically which in this case becomes string values. ![]() The varchar columns in the table are of variable length string that can hold either numeric or character or both. Solutions Of course there are some best practices that MySQL users can follow to avoid those problems: use a smaller datatype to store their UUIDs: BINARY (16) store the UUIDs sequentially: use UUIDTOBIN (. InnoDB stores data in the PRIMARY KEY order and all the secondary keys also contain PRIMARY KEY. This means that these databases support syntax like WHERE id = '33555c1f-2211-4a7d-9f66-35cf5413444e' natively, and you can copy/paste those queries around and they will continue to work since they are conforming to the sql standard. Varchar in MySQL is a data type used for storing text whose length can have a maximum of 65535 characters. 1 2 yveslaptop: uuidgen 83fda883-86d9-4913-9729-91f20973fa52 There are officially 5 types of UUID values, version 1 to 5, but the most common are: time-based (version 1 or version 2) and purely random (version 3). UUID has 36 characters which make it bulky. Many other databases has a proper uuid type, like postgresql has the uuid type, and SQL Server has a guid type. I think the recommended/best practices to storing uuid in rdbms is by using binary(16) ![]() You then use UUIDTOBIN () or BINTOUUID () to convert from binary to the text human readable UUID stuff. ![]() I would like to add another view this isn't as much as if Laravel knows how the column is persisted, but that it breaks compatibility with other systems, including existing raw/manual queries. CREATE TABLE MyTable ( Col1 AS INTEGER NOT NULL PRIMARY KEY, Col2 AS NVARCHAR (100) NOT NULL ) Define variable types. You can store as CHAR (36) or store as VARCHAR (36) (both make sense) or store as STRING (probably better to use CHAR (36)) but you can store it as BINARY (16) as well.
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