JSON type instead of JSONB type

Query goal:

"In general, most applications should prefer to store JSON data as jsonb, unless there are quite specialized needs, such as legacy assumptions about ordering of object keys." (https://www.postgresql.org/docs/current/datatype-json.html)

Notes about the query:

The query finds columns of base tables that have json type instead of jsonb type.

Query type:

Problem detection (Each row in the result could represent a flaw in the design)

Query reliability:

High (Few or no false-positive results)

Query license:

MIT License

Fixing suggestion:

In case of base table columns one can change the type of the column with an ALTER TABLE statement. If there are views that depend on the column, then these have to be dropped and later recreated.

Data source:

INFORMATION_SCHEMA only

SQL query:

Click on query to copy it

SELECT table_schema, table_name, table_type, column_name 
FROM INFORMATION_SCHEMA.columns INNER JOIN INFORMATION_SCHEMA.tables USING (table_schema, table_name)
WHERE data_type='json' AND 
table_schema NOT IN (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name<>'public' AND
schema_owner='postgres' AND schema_name IS NOT NULL)
AND table_type='BASE TABLE'
ORDER BY table_schema, table_name, ordinal_position;

SQL statements for generating SQL statements that help us to fix the problem

SQL query	Description
WITH json_columns AS (SELECT table_schema, table_name, column_name, ordinal_position FROM INFORMATION_SCHEMA.columns INNER JOIN INFORMATION_SCHEMA.tables USING (table_schema, table_name) WHERE data_type='json' AND table_type='BASE TABLE' AND table_schema NOT IN (SELECT schema_name FROM INFORMATION_SCHEMA.schemata WHERE schema_name<>'public' AND schema_owner='postgres' AND schema_name IS NOT NULL)) SELECT format('ALTER TABLE %1$I.%2$I ALTER COLUMN %3$I SET DATA TYPE JSONB;', table_schema, table_name, column_name) AS statements FROM json_columns ORDER BY table_schema, table_name, ordinal_position;	Change the type of the base table column.

SQL query

Description

WITH json_columns AS (SELECT table_schema, table_name, column_name, ordinal_position
FROM INFORMATION_SCHEMA.columns INNER JOIN INFORMATION_SCHEMA.tables USING (table_schema, table_name)
WHERE data_type='json' AND table_type='BASE TABLE' AND 
table_schema NOT IN (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name<>'public' AND
schema_owner='postgres' AND schema_name IS NOT NULL))
SELECT format('ALTER TABLE  %1$I.%2$I ALTER COLUMN %3$I SET DATA TYPE JSONB;',  table_schema, table_name, column_name) AS statements
FROM json_columns
ORDER BY table_schema, table_name, ordinal_position;

Change the type of the base table column.

Collections where the query belongs to

Collection name	Collection description
Find problems automatically	Queries, that results point to problems in the database. Each query in the collection produces an initial assessment. However, a human reviewer has the final say as to whether there is a problem or not .

Collection name

Collection description

Find problems automatically

Queries, that results point to problems in the database. Each query in the collection produces an initial assessment. However, a human reviewer has the final say as to whether there is a problem or not .

Categories where the query belongs to

Category name	Category description
Data types	Queries of this category provide information about the data types and their usage.
Hierarchical data	Queries of this catergory provide information about storing hierarchical data in the database.

Category name

Category description

Data types

Queries of this category provide information about the data types and their usage.

Hierarchical data

Queries of this catergory provide information about storing hierarchical data in the database.