How to set default row for query that returns no rows?
Edit: This would be SQL Server. These use the fact that MIN () returns NULL when there are no rows. WW. WW. If your base query is expected to return only one row, then you could use this trick: (Oracle code, not sure if NVL is the right function for SQL Server.)
How to use DEFAULT value in SELECT query?
And if there is no rows with org_id = 3 in the table I want to return 0. If you want to show 0 (alas 1 row) when your query returns 0 rows, then you could use: The above do not work if you want to use default name for name field and it works only if you use number field .
When do you add default values to a table?
The default values that you set will appear in the field or control whenever you create a new record in your database. You add a default value to a table field or form control whenever you want Access to enter a value in a new record automatically. For example, you can have Access always add the current date to new orders.
How to make a query return an empty row?
1) run the query and put results in a temp table (or table variable) 2) check to see if the temp table has results 3) if not, return an empty row by performing a select statement similar to this (in SQL Server): Where columnA, columnB and columnC are your actual column names.
How to reduce the number of rows in a query?
SELECT emp.empno, emp.lastname, dept.deptname FROM (SELECT empno, lastname FROM emp WHERE salary > 50000.00) as e LEFT OUTER JOIN dept ON emp.workdept = dept.deptno WITH UR; Works better, applies the inner join predicates first, reducing number of rows to be joined. OR requires Stage 2 processing.
What to look for in a query optimization?
A treasure trove of data is also included, such as row size, CPU cost, I/O cost, and details on which indexes were utilized. In general, what we are looking for are scenarios in which large numbers of rows are being processed by any given operation within the execution plan.
How to return default value from SQL query?
I would suggest that the best way to do is that first declare @name . Then set this value based on user id and then if @name is null show default name otherwise show name…
How to return a value with no rows in TSQL?
If the inner query has a matching row, then 1 is returned. The outer query (with ISNULL) then returns this value of 1. If the inner query has no matching row, then it doesn’t return anything. The outer query treats this like a NULL, and so the ISNULL ends up returning 0.