Updating a column in oracle dating officer police site

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I work a lot with Data Warehouse data, where we many times have duplicate data for speed purposes, etc.

And, some times, rater than using a ginormous INSERT or UPDATE statement, I actually build the records first with mostly empty columns, and then fill in a few columns at the time.

--DROP TABLE employees PURGE; --DROP TABLE departments PURGE; CREATE TABLE departments ( department_id NUMBER(2) CONSTRAINT departments_pk PRIMARY KEY, department_name VARCHAR2(14), location VARCHAR2(13) ); INSERT INTO departments VALUES (10,'ACCOUNTING','NEW YORK'); INSERT INTO departments VALUES (20,'RESEARCH','DALLAS'); INSERT INTO departments VALUES (30,'SALES','CHICAGO'); INSERT INTO departments VALUES (40,'OPERATIONS','BOSTON'); COMMIT; CREATE TABLE employees ( employee_id NUMBER(4) CONSTRAINT employees_pk PRIMARY KEY, employee_name VARCHAR2(10), job VARCHAR2(9), manager_id NUMBER(4), hiredate DATE, salary NUMBER(7,2), commission NUMBER(7,2), department_id NUMBER(2) CONSTRAINT emp_department_id_fk REFERENCES departments(department_id) ); INSERT INTO employees VALUES (7369,'SMITH','CLERK',7902,to_date('','dd-mm-yyyy'),800, NULL,20); INSERT INTO employees VALUES (7499,'ALLEN','SALESMAN',7698,to_date('20-2-1981','dd-mm-yyyy'),1600,300,30); INSERT INTO employees VALUES (7521,'WARD','SALESMAN',7698,to_date('22-2-1981','dd-mm-yyyy'),1250,500,30); INSERT INTO employees VALUES (7566,'JONES','MANAGER',7839,to_date('2-4-1981','dd-mm-yyyy'),2975, NULL,20); INSERT INTO employees VALUES (7654,'MARTIN','SALESMAN',7698,to_date('28-9-1981','dd-mm-yyyy'),1250,1400,30); INSERT INTO employees VALUES (7698,'BLAKE','MANAGER',7839,to_date('1-5-1981','dd-mm-yyyy'),2850, NULL,30); INSERT INTO employees VALUES (7782,'CLARK','MANAGER',7839,to_date('9-6-1981','dd-mm-yyyy'),2450, NULL,10); INSERT INTO employees VALUES (7788,'SCOTT','ANALYST',7566,to_date('13-JUL-87','dd-mm-rr')-85,3000, NULL,20); INSERT INTO employees VALUES (7839,'KING','PRESIDENT', NULL,to_date('','dd-mm-yyyy'),5000, NULL,10); INSERT INTO employees VALUES (7844,'TURNER','SALESMAN',7698,to_date('8-9-1981','dd-mm-yyyy'),1500,0,30); INSERT INTO employees VALUES (7876,'ADAMS','CLERK',7788,to_date('13-JUL-87', 'dd-mm-rr')-51,1100, NULL,20); INSERT INTO employees VALUES (7900,'JAMES','CLERK',7698,to_date('3-12-1981','dd-mm-yyyy'),950, NULL,30); INSERT INTO employees VALUES (7902,'FORD','ANALYST',7566,to_date('3-12-1981','dd-mm-yyyy'),3000, NULL,20); INSERT INTO employees VALUES (7934,'MILLER','CLERK',7782,to_date('23-1-1982','dd-mm-yyyy'),1300, NULL,10); COMMIT; These tables are a variant of the EMP and DEPT tables from the SCOTT schema.

You will see a lot of Oracle examples on the internet using the tables from the SCOTT schema.

All Data Manipulation Language (DML) changes are done as part of a transaction.

But, the syntax example above might not show the whole truth, since we can have a situation like this: In the expanded version of our UPDATE syntax above, the value that we want to update column1 with, actually comes from a different table.

BUT, in this post I really wanted to show you how to update multiple columns in a table at once.

Because you're updating INV_TOTAL with INV_DISCOUNT, and the database is going to use the I guess the issue here is that you are updating INV_DISCOUNT and the INV_TOTAL uses the INV_DISCOUNT. You can use returning clause of update statement to use the new INV_DISCOUNT and use it to update INV_TOTAL.

This means that you have to select on all the fields which comprise a unique key -- a non-unique primary key is not sufficient.

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