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SQL | Count(*) vs Count(1) Vs Count(colname) #sqltips
- November 29, 2023
- Posted by: MainInstructor
- Category: SQL
Video Title: SQL | Count(*) vs Count(1) Vs Count(colname) #sqltips
We have five records in the department table running account star on this table gives us the right number of Records which is five if we replace the Star by a one we still get the correct number of records as five but if we replace this constant value by the column name
Department name we get four as the output this is because count column name does not count the null values in the records
Video Keywords: SQL, best,training,tutorial,coding,knowstar
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Yes, the concept is this way but you need to explain why it doesnt take nulls for count(deptname).
Reason is count(deptname) counts the present columns values but count(1) counts the total no of 1s generated per row. So, count(1) would be always >= count(column).
A question for you, what would be the output of: (dont run it to get the answer or even after running explain why that answer)
Select count(NULL) from table;
Great little tips.
Brilliant