Sql count where

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;

To count number of rows in SQL table

SELECT count(*)
FROM information_schema.columns
WHERE table_name = 'Your_table_nale';

Sql count(*)

SELECT COUNT(column_name)
FROM table_name
WHERE condition;

Condition in count sql

select count(case Position when 'Manager' then 1 else null end)
from ...


select sum(case Position when 'Manager' then 1 else 0 end)
from ...

Counting in sql

SELECT COUNT(*) FROM EMPLOYEES;

Sql count where

SELECT count(CASE WHEN gender = 'F' THEN 1 ELSE NULL END) women_count,
       count(CASE WHEN gender = 'M' THEN 1 ELSE NULL END) men_count
FROM people;

-2

Similar codes

25 votes221 views6 answers
Import database mysql command line
SQL
0 vote174 views1 answer
Oracle sql count occurrences of value in column
SQL
0 vote187 views2 answers
Starting mysql service from mac
SQL
5 votes189 views3 answers
Mysql remove unique constraint
SQL
3 votes187 views2 answers
Check data in table mysql
SQL
0 vote185 views1 answer
How to fetch unique records from two tables
SQL
1 vote200 views1 answer
Sql first day quarter
SQL
10 votes191 views3 answers
Join multiple tables sql
SQL
0 vote186 views1 answer
Postgresql add not null and not empty constraint
SQL
1 vote195 views5 answers
Postgresql difference between two dates in days
SQL