Updating table in oracle jewich dating sait

Posted by / 27-Jul-2017 14:50

select * from t_u; A B C - - - 1 2 3 select * from t; A B - - 1 2 select * from u; A C - - 1 3 </CODE create table t ( a number primary key, b number ); create table u ( a number primary key, c number ); insert into t values ( 1, 1 ); insert into u values ( 1, 2 ); create view t_u as select t.a, b, c from t inner join u on ( t.a = u.a ); create or replace trigger t_u_trigger instead of update on t_u begin update t set b = :new.b where a = :new.a; update u set c = :new.c where a = :new.a; end; / select * from t_u; A B C - - - 1 1 2 update t_u set b = 2, c = 3; 1 row updated.

select * from t_u; A B C - - - 1 2 3 select * from t; A B - - 1 2 select * from u; A C - - 1 3 i didn't get answer to my question clearly....i what is that if i update a table in which the salary of an employee is updated than simultaneously the dept of employee should change to some other dept.

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By 'join update' I mean the situation where we have two tables and want to update some of the rows in the first table based on values that exist in the second table.

drop table t; drop table s; create table t (id number, name varchar2(32)); create table s (id number, name varchar2(32)); insert into t values (1,'1'); insert into t values (2,'2'); insert into t values (3,'3'); insert into t values (4,'4'); insert into t values (5,'5'); insert into s values (3,'three'); insert into s values (5,'five'); select * from t; update t set name = (select name from s where = s.id); select * from t; Our first table (t) simply has the numbers 1-5 in the 'id' and 'name' column but we want to update some of the names based on the contents of the second table (s) but this table only has values for two of the rows. 1 rows inserted 1 rows inserted 1 rows inserted 1 rows inserted 1 rows inserted 1 rows inserted 1 rows inserted ID NAME ---------------------- -------------------------------- 1 1 2 2 3 3 4 4 5 5 5 rows selected 5 rows updated ID NAME ---------------------- -------------------------------- 1 2 3 three 4 5 five 5 rows selected The problem here is that the update isn't a true 'join' as every row is going to be updated and if the 'join' fails then a null is written.

Cheers." id="ctl00_m_m_i_ctl00_gr_ctl07_bestanswerbody" class="textarea-bestanswerhidden" name="bestanswerbody" answerbody Id="1964923" / Another aspect from a strictly design perspective is: why are you storing the same data in two different tables?

For different access to the same data, views are a handy tool. create table t ( a number primary key, b number ); create table u ( a number primary key, c number ); insert into t values ( 1, 1 ); insert into u values ( 1, 2 ); create view t_u as select t.a, b, c from t inner join u on ( t.a = u.a ); create or replace trigger t_u_trigger instead of update on t_u begin update t set b = :new.b where a = :new.a; update u set c = :new.c where a = :new.a; end; / select * from t_u; A B C - - - 1 1 2 update t_u set b = 2, c = 3; 1 row updated.

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I need to perform this update on a base table in application that should not be altered. Can you guys please help me in this through PL/SQL procedure as I am not much experienced on that. 1 declare 2 v1 varchar2(500); 3 begin 4 select field1 into v1 from long_test; 5 dbms_output.put_line(v1); 6 update long_test set field2 = v1; 7* end; SQL> /" id="ctl00_m_m_i_ctl00_gr_ctl11_bestanswerbody" class="textarea-bestanswerhidden" name="bestanswerbody" answerbody Id="5020855" / Select the long data into a variable. This worked fine for me to the records having length up to 4000. Can anyone please help me out as its an urgent requirement.....thanks in advance." id="ctl00_m_m_i_ctl00_gr_ctl13_bestanswerbody" class="textarea-bestanswerhidden" name="bestanswerbody" answerbody Id="5023089" / Hi All, With all of your valuable suggestions, i had came to an approach but got hanged in the middle. Created a temporary table for the table that i want to update. converted the column in temporary table having long data type to CLOB. Applied the REPLACE operation which i want to perform on that temporary table. Updated contents in main table with contents from temporary table. ORA-22835: Buffer too small for CLOB to CHAR or BLOB to RAW conversion (actual: 4790, maximum: 4000) The other hard part is that main table can't be done any alteration.

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