Daily SQL scripts in GreenPlum

--1. Specify the total number of days in the month

SELECT EXTRACT(DAY FROM CAST('2017-08-01' AS DATE) + INTERVAL '1 month' - INTERVAL '1 day')

SELECT EXTRACT(DAY FROM CAST(TO_CHAR(NOW(),'YYYY-MM')||'-01' AS DATE) + INTERVAL '1 month' - INTERVAL '1 day')

--2. Modify the default search (search_path) path

SHOW search_path;
SET search_path TO your_schema_name;

--3.Change the schema owner

ALTER SCHEMA your_schema_name OWNER TO other_user;

--4.Modify the table owner

ALTER TABLE your_table_name OWNER TO other_user;

--5. Grant query or all permissions to the specified user

GRANT SELECT ON TABLE your_table_name TO other_user;
GRANT ALL ON TABLE your_table_name TO other_user;

--6. Grant the specified user Schema usage permissions

GRANT USAGE ON SCHEMA your_schema_name TO other_user;

--7. Recycle the specified user’s schema usage permissions

REVOKE ALL ON SCHEMA your_schema_name FROM other_user;

--Different object authorization keywords

TABLES,VIEWS,SEQUENCES: SELECT INSERT UPDATE DELETE RULE ALL
EXTERNAL TABLES: SELECT RULE ALL
DATABASES: CONNECT CREATE TEMPORARY|TEMP ALL
FUNCTIONS: EXECUTE
PROCEDURAL LANGUAGES: USAGE
SCHEMAS: CREATE USAGE ALL

--8. Grant function execution permissions in batches

SELECT 'GRANT EXECUTE ON FUNCTION '||routines.routine_name||'('||STRING_AGG(parameters.data_type,',' ORDER BY parameters.ordinal_position)||') TO other_user;' batchgrant
FROM information_schema.routines
JOIN information_schema.parameters ON routines.specific_name=parameters.specific_name
WHERE routines.specific_schema='product'
GROUP BY routines.routine_name

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