Count sql

Sql count

/*COUNT(column_name) will return the number of rows from the column 
that are not NULL*/
SELECT COUNT(column_name)
FROM table_name;

/*COUNT(*) will return the number of rows from the table*/
SELECT COUNT(*)
FROM table_name;

Sql join

-- Rows with ID existing in both a, b and c
-- JOIN is equivalent to INNER JOIN
SELECT a.ID, a.NAME, b.VALUE1, c.VALUE1 FROM table1 a 
  JOIN table2 b ON a.ID = b.ID
  JOIN table3 c ON a.ID = c.ID
WHERE a.ID >= 1000;
-- ⇓ Test it ⇓ (Fiddle source link)

Source: sqlfiddle.com

Count sql

SELECT COUNT(column_name)
FROM table_name
WHERE condition;

Counting in sql

SELECT COUNT(*) FROM EMPLOYEES;

Similar codes

0 vote392 views1 answer
Check if mysql db is used
SQL
0 vote365 views1 answer
Returning with sqlalchemy
SQL
0 vote369 views1 answer
Difference between min and max date sql
SQL
1 vote378 views1 answer
Mysql previous year
SQL
0 vote377 views1 answer
Sqlite get date only
SQL
1 vote355 views2 answers
Mysql remove first and last character from string
SQL
22 votes343 views3 answers
Sql cheat sheet
SQL
0 vote338 views1 answer
How to return only the Date from a SQL Server DateTime datatype
SQL
0 vote417 views2 answers
Remove mysql workbench ubuntu
SQL
0 vote451 views2 answers
Sqlalchemy default value for column
SQL