Sql count(*)

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;

Similar codes

0 vote204 views1 answer
Mysql shell ERROR: Not connected.
SQL
6 votes196 views1 answer
Update left join mysql
SQL
14 votes226 views2 answers
Oracle limit rows
SQL
1 vote235 views5 answers
Postgresql difference between two dates in days
SQL
0 vote201 views5 answers
Sql table intermédiaire
SQL
0 vote201 views1 answer
Sql date d'aujourd'hui
SQL
0 vote262 views1 answer
SQLSTATE[42000]: Syntax error or access violation: 1140 Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause
SQL
1 vote201 views1 answer
Add time to date sql
SQL
-1 vote193 views2 answers
How to display top 50 rows?
SQL
2 votes201 views1 answer
Sql create database
SQL