CREATE TABLE IF NOT EXISTS public.organizations ( organization_id text COLLATE pg_catalog."default" NOT NULL, name text COLLATE pg_catalog."default", contact_name text COLLATE pg_catalog."default", contact_email text COLLATE pg_catalog."default", contact_phone text COLLATE pg_catalog."default", CONSTRAINT organizations_pkey PRIMARY KEY (organization_id) ) TABLESPACE pg_default; CREATE TABLE IF NOT EXISTS public.licenses ( license_id text COLLATE pg_catalog."default" NOT NULL, organization_id text COLLATE pg_catalog."default" NOT NULL, description text COLLATE pg_catalog."default", product_name text COLLATE pg_catalog."default" NOT NULL, license_type text COLLATE pg_catalog."default" NOT NULL, comment text COLLATE pg_catalog."default", CONSTRAINT licenses_pkey PRIMARY KEY (license_id), CONSTRAINT licenses_organization_id_fkey FOREIGN KEY (organization_id) REFERENCES public.organizations (organization_id) MATCH SIMPLE ON UPDATE NO ACTION ON DELETE NO ACTION NOT VALID ) TABLESPACE pg_default;
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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;