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Posted by / 19-Nov-2019 18:32

Plsql program for updating

Unlike strings and numbers, dates are quite complicated: not only are they highly formatted data, but there are also many rules for determining valid values and valid calculations (leap days and years, daylight saving time changes, national and company holidays, date ranges, and so on).

Fortunately, Oracle Database and PL/SQL provide a set of true date and time datatypes that store both date and time information in a standard internal format, and they also have an extensive set of built-in functions for manipulating the date and time.

Here are some guidelines: Getting the current date and time.

PL/SQL developers often need to retrieve and work with the current date and time.

Code Listing 2: Calls to SYSDATE and SYSTIMESTAMP and the returned values Because I have passed dates and time stamps to DBMS_OUTPUT.

PUT_LINE, Oracle Database implicitly converts them to strings, using the default format masks for the database or the session (as specified by the National Language Settings NLS_DATE_FORMAT parameter).

Here are some examples: To convert a string to a date, use the TO_DATE or the TO_TIMESTAMP built-in function.Then, you can declare a record based on record type that you’ve defined.The following illustrates the syntax of the defining programmer-defined record with SET SERVEROUTPUT ON SIZE 1000000; DECLARE TYPE t_name IS RECORD( first_name employees.first_name%TYPE, last_name employees.last_name%TYPE ); r_name t_name; -- name record n_emp_id employees.employee_id%TYPE := 200; BEGIN SELECT first_name, last_name INTO r_name FROM employees WHERE employee_id = n_emp_id; -- print out the employee's name DBMS_OUTPUT.The quiz questions are shown below and also at PL/SQL Challenge (plsqlchallenge.com), a Website that offers online quizzes for the PL/SQL language.You can read and take the quiz here in and then check your answers in the next issue.

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Steven has been developing software since 1980, spent five years with Oracle back in the "old days" (1987-1992), and was PL/SQL Evangelist for Quest Software (and then Dell) from January 2001 to February 2014 - at which point he returned joyfully to Oracle Corporation.