jsonpath expressions already exist in Postgres and important to note is that jsonpath only works on JSONB data types, not JSON – that's because Postgres treats a JSON data type as text, whereas JSONB has a logical structure to it. Working with jsonpath expressions in Postgres 15Īdditionally, there is new functionality for working with jsonpath expressions. We can say of the data that we stored in our table: does it have unique keys or does it not have unique keys? This might be useful if you have existing JSON datasets where you're trying to understand: do they conform to these requirements or not? You can learn more about it here. IS JSON predicate in Postgres 15Ĭlosely related to constructor syntax is the new IS JSON predicate to check if a certain value is a valid JSON value. It's very good to validate your data here early so that you don't store data incorrectly. For example, if you have JSONB data, JSONB internally would only store one of the two keys. Generally, Postgres has been more permissive in this regard. Depesz wrote more in detail about it here. Now, if you pass a key "a" and another key "a", then it will error out saying "you have duplicate key values". For example, you have a key "a" and a key "b" and it's going to process it successfully. One of the new features here is that you can use the WITH UNIQUE KEY syntax to ensure that a JSON document does not have any duplicate keys. Depesz wrote about this on his blog.įirst of all, let’s have a look at the new SQL/JSON constructor syntax. One of the features is the new SQL/JSON functionality. SQL/JSON constructor syntax in Postgres 15 What we have discussed in this episode of 5mins of Postgres Working with jsonpath expressions in Postgres 15
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