The case sensitivity of the JSON literals differs from that of the SQL null, true, and false literals, It can be written in any lettercase.This case sensitivity also applies to the JSON null, true, and false literals, which always must be written in lowercase.The utf8mb4_bin is a binary collation, you just compare to JSON value.The JSON is a case sensitive.Strings is converting JSON values have a character set of utf8mb4 and a collation of utf8mb4_bin.In the result JSON object() is converted to a string when assigned to the variable.The user defined variables is not a JSON datatypes,here i use variable its looks like a JSON value and has the same character set and collation as a JSON value, it does not have the JSON data type.If multiple objects have the same key, the value for that key in the resulting merged object is an array containing single key values.If you compare the two JSON documents and it’s find a duplicate key found, The earlier document is discarded.When a string is parsed and found to be a valid JSON document, it is also normalized.JSON merge() it combines a two or more json documents and produce a single result.It allows the json_extract function to perform a binary search for the ‘name’ key in the table and read the corresponding value directly.The lookup table has pointers to every key/value pair in the JSON document, sorted on the key.It is stored in an optimized binary format that allows for quicker access to object members and array elements.The most important thing is JSON column cannot not stored as a plain text value.If you try to store an invalid JSON document in a JSON column, you will get an error. The JSON documents can be stored in a JSON column, so you get automatic validation of your data.For strings in the ascii or utf8 character sets, no conversion is needed because ascii and utf8 are subsets of utf8mb4. This character set are converted to utf8mb4 as necessary.The strings used in JSON context using the utf8mb4 character set and utf8mb4_bin collation.A string is a sequence of zero or more unicode characters, wrapped on double quotes, using backslash escapes.The JSON object it takes a list of key/value pairs and returns a JSON object containing those pairs.The each name followed by : (colon) and the name and value pairs are separated by by, (comma).A value can be a string in double quotes, or number, or true or false or null, or an object.these structures can be nested.A JSON array takes a (possibly empty) list of values and returns a JSON array containing those values.An array is an ordered collection of values.An array beings with (right bracket).String: Several plain text characters which usually form a word.
Object: An associative array of key/value pairs.JSON format is one of the important feature in MySQL We have seen clients storing the JSON files in text format inside MySQL and later they are processed by Elastic Search or some other external processing. Previous version of MySQL stores JSON datas as text file in MySQL. Key/Value Pair: A key value pair it follows a specific syntax, The key followed by a colon followed by the value.
If you want more details click here JSON.It is used primarily to transmit data between a server and web application, as an alternative to XML.It’s easy for humans to read and write.It’s easy for machines to parse and generate.Json (Java script object notation ) is a lightweight data-interchange format.
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