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I'm trying to build a query or a PL/SQL code to both execute a query, as well as return the number of results of this query.

Is this possible in a single query? Right now I feel like I'm being very wasteful: I first wrap the query in a COUNT (without ORDER BY) and then run the same query again (without the COUNT). A difference of a few seconds will probably not change the total number of rows, I can live with that. The DB I'm using is Oracle Enterprise 12.2

An easy SQL way: a test table:

create table testTable(a, b, c) as (
    select 1, 'one',   'XX' from dual UNION ALL
    select 2, 'two',   'YY' from dual UNION ALL
    select 3, 'three', 'ZZ' from dual
)

A simple query:

select a, b, c
from testTable 

         A B     C 
---------- ----- --
         1 one   XX
         2 two   YY
         3 three ZZ

3 rows selected.

The query with the number of records :

select a, b, c, count(*) over (partition by 1) as count
from testTable


         A B     C       COUNT
---------- ----- -- ----------
         1 one   XX          3
         2 two   YY          3
         3 three ZZ          3

3 rows selected.

How to get multiple counts with one SQL query?, Both of these will produce the right values: select distributor_id, count(*) total, sum(case when level = 'exec' then 1 else 0 end) ExecCount, sum(case when level� When you use the Execute method to run a query, the RecordsAffected property of the QueryDef object is set to the number of records affected. In a Microsoft Access workspace, if you provide a syntactically correct SQL statement and have the appropriate permissions, the Execute method won't fail — even if not a single row can be modified or

You can try to do something like:

WITH test_query
  AS (SELECT LEVEL just_a_number
        FROM dual
       CONNECT BY level < 101)
SELECT just_a_number
     , COUNT(just_a_number) OVER (ORDER BY 1) total_count
  FROM test_query;

Where COUNT(just_a_number) OVER (ORDER BY 1) will return total number of rows fetched in each row. Note that it may slow down the query.

How to make multiple counts in one query?, To get a count for each of those you can try. SELECT COUNT(CASE WHEN `col1 ` LIKE '%something%' THEN 1 END) AS count1, COUNT(CASE WHEN `col1`� When you use the Execute method to run a query, the RecordsAffected property of the QueryDef object is set to the number of records affected. In a Microsoft Access workspace, if you provide a syntactically correct SQL statement and have the appropriate permissions, the Execute method won't fail — even if not a single row can be modified or

Typically, when I do something like this, I create a stored procedure that returns 2 values. The first would be the result set as a REF CURSOR, and the other a number(12,0) returning the count. Both would of course require separate queries, but since it is in a single stored procedure, it is only one database connection and command being executed.

You are of course right for having your COUNT query forgo the ORDER BY clause.

To answer your question, you are not being wasteful per se. This is common practice in enterprise software.

How to Calculate Multiple Aggregate Functions in a Single Query , Now, in the outer query, we're using once COUNT(*) , which simply but both approaches are equivalent, and we're running only a single� hey guys, what i am trying to do is to see how many recs are going to be retrieved and store that count in a variable upon execute_query. i have used the count_query built in right before my execute_query that i have in a when button pressed trigger,and i have a on_count trigger with the following code at the datablock level of that button Declare my_count varchar2(2); Begin my_count := get

How to Execute a SQL Query Only if Another SQL Query has no , If that predicate returns no rows, they wanted to run another query As can be seen, both queries are executed in roughly the same time on� ##will work with Action Queries only (Create,Alter,Drop,Insert,Update,Delete). ##Returns the count of rows effected by the Query. ##Return type is int ##Return value is optional and can be assigned to an integer variable.

SQL: COUNT Function, In this example, the query will return 6 since there are 6 records in the customers table and all customer_id values are NOT NULL (ie: customer_id is the primary� The COUNT() function returns the number of records returned by a select query. Note: NULL values are not counted. Syntax. COUNT(expression) Parameter Values. Parameter

MySQL Tutorial :: 4.4.8 Counting Rows, COUNT(*) counts the number of rows, so the query to count your animals The following examples show different ways to perform animal census operations. The COUNT() function returns the number of records returned by a select query. Note: NULL values are not counted. Syntax. COUNT(expression) Parameter Values. Parameter

Comments
  • why don't you use %ROWCOUNT , if you are using PL-SQL
  • Please provide the the primary query.
  • thank you. This works great! What does the "1" mean here?
  • I used 1 to have a constant value, so that data are partitioned by a constant value, that is are not partitioned; you could use whatever constant you want