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GROUP BY

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Brave Bee answered on September 24, 2020 Popularity 10/10 Helpfulness 1/10

answer GROUP BY

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GROUP BY

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SELECT <field1, field2, field3…>
FROM <table1_name>
WHERE <condition/expression>
GROUP BY <field1, field2, field3…>

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Source: Grepper

Tags: group-by whatever

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Contributed on Sep 24 2020

Brave Bee

0 Answers Avg Quality 2/10

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group sql

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-- nonagg_col = the columns that are not aggregated
-- agg_col = the columns that are being aggregated with agg funcs
-- agg funcs = count, sum, avg, min, max
SELECT nonagg_col1, nonagg_col2,  COUNT(agg_col) 
FROM table_name
WHERE nonagg_col1 IN ('A','B')
GROUP BY nonagg_col1, nonagg_col2 -- or ROLLUP(nonagg_col1, nonagg_col2) or CUBE(nonagg_col1, nonagg_col2)
HAVING COUNT(agg_col) >10
ORDER BY nonagg_col2 DESC
LIMIT 5;
-- ROLLUP : Hierarchical group-level aggregations of specified columns from left to right
-- CUBE : All possible combination of group-level aggregations

Popularity 10/10 Helpfulness 3/10 Language sql

Source: Grepper

Tags: group grou

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Contributed on Jan 28 2023

Innocent Iguana

0 Answers Avg Quality 2/10

sql group by example

Comment

 SELECT column_name(s)
  FROM table_name
  WHERE condition
  GROUP BY column_name(s)
  HAVING condition
  ORDER BY column_name(s);

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Source: Grepper

Tags: group-by group-b

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Contributed on Jan 26 2021

Jolly Jellyfish

0 Answers Avg Quality 2/10

group by sql

Comment

SELECT NAME, SUM(SALARY) FROM Employee 
GROUP BY NAME;

Popularity 10/10 Helpfulness 2/10 Language sql

Source: Grepper

Tags: group-by group-b

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Contributed on Jun 22 2022

Rasel Ahmed

0 Answers Avg Quality 2/10

SQL GROUP BY

Comment

SELECT country, COUNT(*) AS number
FROM Customers
GROUP BY country;

Popularity 10/10 Helpfulness 2/10 Language sql

Source: Grepper

Tags: group-by group-b

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Contributed on May 20 2022

SAMER SAEID

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GROUP BY in sql

Comment

SELECT CustomerID, SUM(OrderAmount) AS TotalAmount
FROM Orders
GROUP BY CustomerID;

Popularity 10/10 Helpfulness 2/10 Language sql

Source: chat.openai.com

Tags: group-by group-b

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Contributed on Jun 19 2023

Nice Nightingale

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group by

Comment

SELECT
  <column_name>,
  COUNT(<column_name>) AS `value_occurrence` 

FROM
  <my_table>

GROUP BY 
  <column_name>

ORDER BY 
  `value_occurrence` DESC

LIMIT 1;

Popularity 10/10 Helpfulness 2/10 Language sql

Source: stackoverflow.com

Tags: group-by group-b

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Contributed on Nov 04 2021

Alive Antelope

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sql group

Comment

# Concept of group in privilege does not exist in mysql.
# However, They exist in PostgreSQL and SQL Server

# Create group:
CREATE ROLE mygroup [LOGIN FALSE]; # Postgres and SQL Server

# Delete a group
DROP ROLE mygroup; # Postgres and SQL Server

# Add user in a group
ALTER GROUP mygroup ADD USER myuser; # Postgres and SQL Server

# Delete user from a group
ALTER GROUP mygroup DROP USER myuser; # Postgres and SQL Server

# See all available groups
SELECT rolname FROM pg_roles WHERE rollogin = FALSE; # Postgres
SELECT name FROM sys.database_principals WHERE type = 'R' AND is_fixed_role = 0; # SQL Server

# Grant permission to a group
GRANT SELECT, INSERT, UPDATE, DELETE ON mytable TO mygroup; # Postgres and SQL Server

# Revoke permission from a group
REVOKE SELECT, INSERT, UPDATE, DELETE ON mytable FROM mygroup; # Postgres and SQL Server

# Add group to a role
ALTER ROLE myrole SET GROUP mygroup; # Postgres
ALTER ROLE myrole ADD MEMBER mygroup; # SQL Server

# Revoke group from a role
ALTER ROLE myrole DROP GROUP mygroup; # Postgres
ALTER ROLE myrole DROP MEMBER mygroup; # SQL Server

# Enable expiration time on role for a user
ALTER USER myuser VALID UNTIL 'now' + INTERVAL '90 days'; # Postgres
ALTER LOGIN myuser WITH PASSWORD EXPIRATION ON, EXPIRATION_DATE = '2030-12-31'; # SQL Server

# Enable expiration time on role for a group
ALTER GROUP mygroup VALID UNTIL 'now' + INTERVAL '90 days'; # Postgres
ALTER ROLE mygroup WITH PASSWORD EXPIRATION ON, EXPIRATION_DATE = '2030-12-31'; # SQL Server

# Grant schema access to group
GRANT USAGE ON SCHEMA schema_name TO user_or_group_name; # Postgres
GRANT SELECT, INSERT, UPDATE, DELETE ON ALL TABLES IN SCHEMA schema_name TO user_or_group_name;

GRANT SELECT, INSERT, UPDATE, DELETE ON SCHEMA::schema_name TO user_or_group_name; # SQL Server

# Grant database access to group
GRANT CONNECT ON DATABASE database_name TO user_or_group_name; # Postgres
GRANT CONNECT SQL TO user_name; # SQL Server

# Always make sure to grant permission to connect to database and schema
GRANT CONNECT ON DATABASE db_name TO role;
GRANT USAGE ON SCHEMA schema_name TO role;
# Note: They become very powerful when handling with ROLE and USER

Popularity 10/10 Helpfulness 2/10 Language sql

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Contributed on Feb 23 2023

Innocent Iguana

0 Answers Avg Quality 2/10

group by

Comment

-1

SELECT column_name(s)
  FROM table_name
  WHERE condition
  GROUP BY column_name(s)
  HAVING condition
  ORDER BY column_name(s);

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Tags: group-by group-b

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Contributed on Jan 06 2023

Inquisitive Ibex

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group by data

Comment

import pandas as pd
import matplotlib.pyplot as plt
import seaborn as sns
dd=pd.melt(df,id_vars=['Group'],value_vars=['Apple','Orange'],var_name='fruits')
sns.boxplot(x='Group',y='value',data=dd,hue='fruits')

Popularity 10/10 Helpfulness 1/10 Language python

Source: stackoverflow.com

Tags: group-by group-b

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Contributed on Aug 21 2021

Famous Flamingo

0 Answers Avg Quality 2/10

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