Suppose there is a column named column_json which stores json documents. While querying the json data from the database, It is very simple as we just need to write a normal SQL SELECT statement the only difference is we need to provide the key for which we want the data. While creating tables in Oracle database having columns to store json documents we should add a constraint named is_json so that the table only accepts a json document when inserting values in the table as the data type while declaring the json should remain VARCHAR2. Oracle database places no restrictions to tables that can store json objects which means that a column which has JSON data can co-exist with other columns in the table which do not have JSON data or with other columns which have json data. Let us now look into How JSON works in oracle. In the previous section, we discussed the syntax of the various cases. jsonkey: This will return from each document of the json column the value of the key.
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