Explanation: The said code in Oracle's PL/SQL defines a function that retrieves the first five characters of the department name based on the provided department ID. If a department with the given ID is found, it returns the first five characters otherwise, it returns NULL. The two variable...
1.basic syntax create [or replace] function fun_name [(parameter1[,parameter2])...] return data_type is|as [inner_variable] begin plsql_sentences; [exception] [dowith_sentences;] end [fun_name]; 2.Example Usage The sql query below is calculate average in the specify department. create...
SQL> SELECT DBTIMEZONE FROM DUAL; DBTIME --- +00:00 5: Extract(datetime) 作用:找出日期或间隔值的字段值 Example: A: SQL> select extract(month from sysdate) "This Month" from dual; This Month --- 11 B: SQL> select extract(year from add_months sysdate,36)) "3 Years Out" from du...
Oracle FIRST_VALUE() function examples We’ll use theproductstable from thesample databaseto demonstrate theFIRST_VALUE()function: The following example returns the product id, product name, list price, and the name of the product with the lowest price: ...
Using Oracle NTILE() function example The following statement divides into 4 buckets the values in thesalescolumn of thesalesman_performanceview from the year of 2017. SELECTsalesman_id, sales, NTILE(4)OVER(ORDERBYsalesDESC) quartileFROMsalesman_performanceWHEREyear=2017;Code language:SQL (Structured...
Introduction to Oracle SQL course Learn More about SQL Keep learning SQL with DataCamp. I've written a few other tutorials to get you started. I hope you find them helpful. COALESCE() SQL Function FORMAT() SQL Function DATEDIFF() SQL Function Also, consider our SQL Associate Certification, ...
The MIN function returns the minimum value of the expression you provide it. This is almost the same as the lowest value. Just like theMAXfunction, it’s a standard SQL function, so it works in many versions of SQL (Oracle, SQL Server, MySQL, PostgreSQL, and more) ...
oracle之存储过..对于PLSql程序的使用,如果每次使用都要进行编写,会非常的麻烦,这时可以采用过程和函数来命名PLSQL程序,被编译后存储到数据库中,以备后续使用。过程和函数统称为PL/SQL子程序,他们是被命名的
有效的PL/SQL代码块只需要BEGIN和END关键字,并且这两个关键字之间至少要存在一行有效的代码。 PL/SQL代码块的每行代码都使用分号来结束,同时Oracle将整个代码块视为一个执行单元,这意味着先运行完该代码块,然后再将运行结果发送至调用程序或客户工具。下面示例给出了一个匿名PL/SQL代码块: ...
These examples all use the DUAL table, which is a table in Oracle that allows you to display data in a SELECT statement without needing to create or select from a table in your database. Related:The Oracle DUAL Table. Example 1 – Default Format ...