现在我想转换成case语句。 select sum(case when person_status_id in (3,4,6) then (select 1 as x, count(*) as cnt from PERSON w and w.UPDATED_ON> (sysdate-30) )v end) as Completed, sum(case when person_status_id in (5,7,13) then (select 1 as x, count(*) as cnt from P...
The case expression you are talking about is used to derive a value of a single column. It's not like the PL/SQL cas statement that can have whole blocks of code in it. This might help you understand the difference between a case expression and a case statement. http://www.oracle-...
is normally not very useful. In fact, such a result table can be terribly misleading. If you execute the below query for the EMPLOYEES and DEPARTMENTS tables, the result table implies that every employee has a relationship with every department, and we know that this is simply not the case...
CASE N WHEN 1 THEN SELECT "One" WHEN 2 WHEN 3 THEN SELECT "Two or Three" ELSE SELECT "The number is outside range" CASE END; This gives a SQL syntax error. Thanks -- Jeff in Seattle Subject Written By Posted CASE with multiple consecutive WHEN(s) ...
PL/SQL programs benefit from its use. There is nothing special about it other than being the name of a storage area. All of the aboveAnswer: D) All of the aboveExplanation:In the case of PL/SQL Variables –Variables serve as a means for programmers to temporarily store data during code...
In this case, it is easier to create the data model and layout separately. Hence, we will create an empty report first, then add the queries, and then create the layouts. To create a blank report: ChooseFile > New > Report. SelectBuild a new report manually, then clickOK. ...
There may be multiplelistener.orafiles on your computer, one for each Oracle home. To ensure that you use the correctlistener.orafile, check the Oracle home name in the listener service. See"Managing Oracle Database Services"for information on verifying service names. ...
Quick Tip: Oracle SQL Developer calls what most folks think of as a ‘Physical Model’ the ‘Relational Model.’ Same difference, mostly. In SQL Developer, a Physical model allows you to define partitioning schemes, advanced storage parameters, and add your PL/SQL code. You ...
Answer: A. Using NATURAL JOINS in this case can yield unexpected results as there is an implicit searching of columns with identical names which in this case is not present.18.What of the following can be used to fetch non-matching rows along with the matching rows between a source and a...
Using Multiple Columns in a Group : Group By « Query Select « Oracle PL/SQL Tutorial The GROUP BY clause is used for grouping sets of records. WHERE clause constraints are evaluated on the data before it is grouped. HAVING clause constraints are evaluated on the results of the data ...