2) Using the SQL DISTINCT with multiple columns example To find a list of unique cities and countries from theemployeestable, you can specify thecityandcountrycolumns after theDISTINCToperator as shown in the following query: SELECTDISTINCTcity, countryFROMemployees;Code language:SQL (Structured Query...
Multiple columns can be clubbed under a composite primary key. Oracle internally creates unique index to prevent duplication in the column values.Indexes would be discussed later in PL/SQL.Syntax:Column level:COLUMN [data type] [CONSTRAINT <constraint name> PRIMARY KEY]Table...
In tables, it is required to compute the values that are often calculated using several existing columns and with few scalar values of the table. Also, these columns are dependent on one or more other columns. In this way, we can create a computed column using the Coalesce SQL function so...
You can specify multiple columns in a GROUP BY clause. For example, the following query includes the city and description columns from the employee table in a GROUP BY clause: SQL> -- create demo table SQL> create table Employee( 2 ID VARCHAR2(4 BYTE) NOT NULL, 3 First_Name VARCHAR2(...
function ["(" [DISTINCT | ALL] expr [, expr]...")"] ; Some valid built-in function expressions are: LENGTH('BLAKE') ROUND(1234.567*43) SYSDATE 1.8.3 Form III, Java Function Expression java_function_name (expr , expr...) schema.table.java_function_name (expr , expr...) ...
26. What among the following is a type of Oracle SQL functions?Multiple-row functions Single column functions Single value functions Multiple columns functionsAnswer: A. There are basically two types of functions - Single row and Multiple row functions....
(DISTINCT p.plan_id) AS number_of_distinct_plans ,COUNT(DISTINCT p.query_id) AS number_of_distinct_query_ids ,SUM(CASE WHEN rs.execution_type_desc = 'Aborted' THEN count_executions ELSE 0 END) AS Aborted_Execution_Count ,SUM(CASE WHEN rs.execution_type_desc = 'Regular' THEN count_...
Basically I wish to retrieve the object with a distinct ID and the latest version. I will test your query in my case and hopefully it will work! Thanks! //Nichlas Monday, August 2, 2010 1:59 PM When you do group by the ItemID or some other columns, ...
This article is organized into two distinct parts or phases. The first part runs through editing various examples, showing you how to change several sample files to use ADF Faces rather than JSF, and points out some of the differences between JSF and ADF Faces. The second half steps you thr...
You can select which data columns to include by checking the box beside the field name. You can also change the field name by clicking on the existing field name. The new name is then used as an alias for the name the field has in the database. Metadata Shows a table of ...