CREATE TABLE "Logs"( id bigint NOT NULL, product_id bigint, product_price numeric, product_store text, last_updated timestamp with time zone DEFAULT now() ); INSERT into "Logs" VALUES(2095, 13, 249.99, 'BestBuy.com', '2023-04-08 00:20:12.199251+00'); INSERT into "Logs" VALUES(2096, 13, 249.99, 'Target.com', '2023-04-08 00:20:12.199251+00'); INSERT into "Logs" VALUES(2097, 13, 249.99, 'BestBuy.com', '2023-04-09 00:20:12.199251+00'); INSERT into "Logs" VALUES(2098, 13, 249.99, 'BestBuy.com', '2023-04-10 00:20:12.199251+00'); INSERT into "Logs" VALUES(2099, 13, 249.99, 'Target.com', '2023-04-11 00:20:12.199251+00'); INSERT into "Logs" VALUES(2100, 13, 249.99, 'Target.com', '2023-04-12 00:20:12.199251+00'); select json_build_object(product_store, json_build_object('Data', json_agg(t.a))) from ( select product_store, json_build_array(product_price,last_updated) a from "Logs" ) t group by product_store; select product_store, json_build_array(product_price,last_updated) a from "Logs"; -- final JSON with tmp as ( select json_build_object(product_store, json_build_object('Data', json_agg(t.a))) json_row from ( select product_store, json_build_array(product_price,last_updated) a from "Logs" ) t group by product_store) select json_object_agg(key, value) AS result FROM tmp, json_each(json_row);
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PostgreSQL is a open source relational database system and is also knows as Postgres.
CREATE command is used to create a table, schema or an index.
CREATE TABLE table_name (
column1 datatype,
column2 datatype,
....);
ALTER command is used to add, modify or delete columns or constraints from the database table.
ALTER TABLE Table_name ADD column_name datatype;
TRUNCATE command is used to delete the data present in the table but this will not delete the table.
TRUNCATE table table_name;
DROP command is used to delete the table along with its data.
DROP TABLE table_name;
RENAME command is used to rename the table name.
ALTER TABLE table_name1 RENAME to new_table_name1;
INSERT Statement is used to insert new records into the database table.
INSERT INTO table_name (column1, column2, column3, ...) VALUES (value1, value2, value3, ...);
Select statement is used to select data from database tables.
SELECT column1, column2, ...
FROM table_name;
UPDATE statement is used to modify the existing values of records present in the database table.
UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;
DELETE statement is used to delete the existing records present in the database table.
DELETE FROM table_name where condition;