PostgresでのJSONデータの理解

NoSQL入門

Jake Roach

Data Engineer

PostgresのJSONとJSONB

{
    'guardian': 'mother',
    'status': 'A',
    'educations': [4, 4],
    'jobs': {
        'P1': 'teacher',
        'P2': 'at_home'
    }
}

CREATE TABLE students
    <column-name> JSON,
    <column-bame> JSONB
;

JSON

JSONB

JSON型の列を含むPostgresテーブル。

SELECT
    address,
    famsize,
    ...
FROM students
[WHERE | GROUP BY | ORDER BY];

次も行います:

import sqlalchemy
import pandas as pd

# Create a connection
db_engine = sqlalchemy.create_engine(
    "postgresql+psycopg2://<user>:<password>@<host>:5432/<database>"
)

# Write a query
query = "SELECT * FROM table_name;"

# Execute the query, show results
results = pd.read_sql(query, db_engine)

NoSQL入門