Oracle if updating then trouble with the family responsibility office dating

06-Dec-2017 09:21

Would you suggest here using delete the child record and then updating the parent and then re-inserting the child with the new value, or using update_cascade? SOmetime 8 columns and each is about 10 to 20 characters.ANyway, I notice that my procedure is slow when I try to do something with the database. I am doing a lot of IFs and I am wondering whether I cao commit all updates at once or rollback. If I have two tables that has many-to-many relationship and thus are implemented using three table design with many to one to the intermediate table.If updates results in 0 rows updated would it raise any excpetion? Since the intermediate table has foreign keys to both tables, I can not seem to updated the parent when a user wants to change the column value in the parent. THere is a database that I select/update from that uses several columns for primary keys.You may wish to update records in one table based on values in another table.

Like the IF/THEN statement, the THEN clause statements will only be executed if the condition is true.

5) must be true before the THEN clause is executed.

If v_numb is equal to or less than 5, or if it evaluates to NULL, the program control jumps to the statement after the END IF clause.

create table Employee( 2 ID VARCHAR2(4 BYTE) NOT NULL, 3 First_Name VARCHAR2(10 BYTE), 4 Last_Name VARCHAR2(10 BYTE), 5 Start_Date DATE, 6 End_Date DATE, 7 Salary Number(8,2), 8 City VARCHAR2(10 BYTE), 9 Description VARCHAR2(15 BYTE) 10 ) 11 / Table created.

SQL select * from Employee 2 / ID FIRST_NAME LAST_NAME START_DAT END_DATE SALARY CITY DESCRIPTION ---- -------------------- -------------------- --------- --------- ---------- ---------- --------------- 01 Jason Martin 25-JUL-96 25-JUL-06 1234.56 Toronto Programmer 02 Alison Mathews 21-MAR-76 21-FEB-86 6661.78 Vancouver Tester 03 James Smith 12-DEC-78 15-MAR-90 6544.78 Vancouver Tester 04 Celia Rice 24-OCT-82 21-APR-99 2344.78 Vancouver Manager 05 Robert Black 15-JAN-84 08-AUG-98 2334.78 Vancouver Tester 06 Linda Green 30-JUL-87 04-JAN-96 4322.78 New York Tester 07 David Larry 31-DEC-90 12-FEB-98 7897.78 New York Manager 08 James Cat 17-SEP-96 15-APR-02 1232.78 Vancouver Tester 8 rows selected.

Like the IF/THEN statement, the THEN clause statements will only be executed if the condition is true.

5) must be true before the THEN clause is executed.

If v_numb is equal to or less than 5, or if it evaluates to NULL, the program control jumps to the statement after the END IF clause.

create table Employee( 2 ID VARCHAR2(4 BYTE) NOT NULL, 3 First_Name VARCHAR2(10 BYTE), 4 Last_Name VARCHAR2(10 BYTE), 5 Start_Date DATE, 6 End_Date DATE, 7 Salary Number(8,2), 8 City VARCHAR2(10 BYTE), 9 Description VARCHAR2(15 BYTE) 10 ) 11 / Table created.

SQL select * from Employee 2 / ID FIRST_NAME LAST_NAME START_DAT END_DATE SALARY CITY DESCRIPTION ---- -------------------- -------------------- --------- --------- ---------- ---------- --------------- 01 Jason Martin 25-JUL-96 25-JUL-06 1234.56 Toronto Programmer 02 Alison Mathews 21-MAR-76 21-FEB-86 6661.78 Vancouver Tester 03 James Smith 12-DEC-78 15-MAR-90 6544.78 Vancouver Tester 04 Celia Rice 24-OCT-82 21-APR-99 2344.78 Vancouver Manager 05 Robert Black 15-JAN-84 08-AUG-98 2334.78 Vancouver Tester 06 Linda Green 30-JUL-87 04-JAN-96 4322.78 New York Tester 07 David Larry 31-DEC-90 12-FEB-98 7897.78 New York Manager 08 James Cat 17-SEP-96 15-APR-02 1232.78 Vancouver Tester 8 rows selected.

All INSTEAD OF triggers are fired for each row and you cannot narrow down the event by column.