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

0 vote115 views1 answer
R dbConnect(odbc::odbc() to ms sql server remote
SQL
2 votes140 views1 answer
Oracle kill session by sql_id
SQL
3 votes121 views2 answers
Sqlite print all column names
SQL
40 votes189 views4 answers
PostgreSQL add column
SQL
0 vote110 views1 answer
Compare two tables to find unmatched records
SQL
0 vote128 views1 answer
How to print sql query
SQL
0 vote131 views1 answer
Disable database droping sql
SQL
11 votes178 views2 answers
Sql between date range
SQL
28 votes117 views6 answers
Sql update
SQL
0 vote132 views2 answers
What is rownum in oracle
SQL