sql count

1SELECT count(*)
2FROM information_schema.columns
3WHERE table_name = 'Your_table_nale';
4

1/*COUNT(column_name) will return the number of rows from the column 
2that are not NULL*/
3SELECT COUNT(column_name)
4FROM table_name;
5
6/*COUNT(*) will return the number of rows from the table*/
7SELECT COUNT(*)
8FROM table_name;

1SELECT COUNT(*)
2FROM dbo.bigTransactionHistory;
3

1SELECT COUNT(column_name)
2FROM table_name
3WHERE condition;