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

2 votes240 views1 answer
SELECT INTO
SQL
1 vote242 views1 answer
How to put value in variable mysql
SQL
1 vote235 views1 answer
Get rows affected mysql python
SQL
4 votes366 views6 answers
Laravel jwt
SQL
8 votes235 views1 answer
Mysql restore database
SQL
1 vote239 views1 answer
Oracle turn off constraint
SQL
0 vote229 views1 answer
Sql server select top 2 of each group
SQL
0 vote264 views1 answer
Python sql passer des parametres dans une requet pymysql
SQL
4 votes229 views1 answer
Wilayah indonesia sql
SQL
0 vote230 views1 answer
How to find database collation in postgres
SQL