SELECT COUNT(*): This is the main part of the SQL query. It uses the COUNT() function to count the number of rows in the 'orders' table. The asterisk (*) is a wildcard that represents all columns in the table. S
SELECT working_area, COUNT(*):This is the main part of the SQL query. It selects the 'working_area' column from the 'agents' table and counts the number of occurrences of each distinct value in the 'working_area' column using the COUNT(*) function. The result will include two columns...
In response, the database system, rewrites the query to: compute the number of distinct values by counting the bits in the bitmap data of the materialized view that are set to the first value, and obtains the aggregate value for the additional expression in the materialized view.SABINA PET...
In response, the database system, rewrites the query to: compute the number of distinct values by counting the bits in the bitmap data of the materialized view that are set to the first value, and obtains the aggregate value for the additional expression in the materialized view.SABINA PET...
On Estimating COUNT, SUM, and AVERAGE Relational Algebra Queries - 脰zsoyoglu, Du, et al. - 1991 () Citation Context ...the estimators due to Goodman [9], Chao [4], and Burnham and Overton [2, 3] which have been used earlier in the database context in the work of Hou, Ozsoyo...
SELECT COUNT(*): This is the main part of the SQL query. It selects the count of all rows from the 'agents' table using the COUNT(*) function. The result will be a single row with a single column containing the total number of rows in the 'agents' table. ...