• 13. 1. 2020
  • Ing. Jan Zedníček - Data & Finance
  • 0

SQL COUNT function belongs to Aggregate functions and it is one of the most easy-to-use and also most used functions of SQL. It enables user to count rows in certain column or rows in whole table.

(!!!) NULL records are missed out if we count number of records above certain column using sql COUNT.

SQL COUNT function Syntax and Examples

1 Number of rows in whole table:

FROM dbo.Table

Returns count of all records in the table where at least 1 column value is non-empty

2 Number of records with non-empty value in selected column:

SELECT COUNT(Column) AS Number_of_non-empty_rows
FROM dbo.Table

Returns number of non-empty (NOT NULL) values above the column “Column”

3 Agregated number of all records in the table through certain fields:

SELECT Column, COUNT(*) AS Row_Count_by_Column
FROM dbo.Table

Returns aggregated number of records through all unique values of “Column” field. Clause GROUP BY is mandatory in this case.

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Ing. Jan Zedníček - Data & Finance

My name is Jan Zedníček and I work as a freelancer. I have been working as a freelancer for many companies for more than 10 years.
I used to work as a financial controller, analyst and manager at many different companies in field of banking and manufacturing. When I am not at work, I like playing volleyball, chess, doing a workout in the gym and I enjoy tasting of best quality rums.
I am trying to summarize all my knowledge on this website not to forget them and to put them forward to anyone.

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