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The COUNT function returns the number of rows or values in a set of rows or values. Note: The result of the function can be affected by the enablement of the large_aggregation configuration parameter.
- Db2 12 - Db2 SQL - COUNT aggregate function - IBM
The argument of COUNT (DISTINCT expression) is a set of...
- IBM Documentation
IBM Documentation.
- Db2 12 - Db2 SQL - COUNT aggregate function - IBM
1) Using DB2 COUNT(*) function to return the number of rows from a table examples. This example uses the COUNT(*) function to find the number of books from the books table: SELECT COUNT (*) FROM books; Code language: SQL (Structured Query Language) (sql) Here is the output: BOOK_COUNT ----- 1091 Code language: SQL (Structured Query Language) (sql)
The argument of COUNT (DISTINCT expression) is a set of values. The function is applied to the set of values derived from the argument values by the elimination of null values and redundant duplicate values. The result is the number of different nonnull values in the set.
21 kwi 2014 · You can compute counts in separate query and then join it to the original query: SELECT customerID, customerGroup, ProductID, ProductName, AlertName, t2.alert_count as AlertName, AlertLevel, more data....
IBM Documentation.
The COUNT () function returns the number of rows that matches a specified criterion. The AVG () function returns the average value of a numeric column. The SUM () function returns the total sum of a numeric column. Let us see the syntax for each function below. Syntax: COUNT () SELECT COUNT(column_name) FROM table_name. WHERE condition;
1) Using Db2 GROUP BY clause with COUNT(*) function. This statement uses the GROUP BY clause with the COUNT(*) function to find the number of books by publishers: SELECT publisher_id, COUNT (*) book_count FROM books GROUP BY publisher_id; Code language: SQL (Structured Query Language) (sql)
