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Updating a table from another table in oracle

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update tab a set col1 = -1 from tab b where a.col2 = b.col2 and a.col3 = b.col3 and a.col3 = b.col4 Can anyone throw some light on this? I looks like it should be something like this: update a set col1 = -1 from tab a, tab b where a.col2 = b.col2 and a.col3 = b.col3 and a.col4 = b.col4 HTH, Ananthram" id="ctl00_m_m_i_ctl00_gr_ctl01_bestanswerbody" class="textarea-bestanswerhidden" name="bestanswerbody" answerbody Id="5190317" / update tab a set col1 = -1 where exists (select 1 from tab b where a.col2 = b.col2 and a.col3 = b.col3 and a.col3 = b.col4 ) Method 2: update tab a set (col1,col7,col8) = (select -1, col7,col8 from tab b where a.col2 = b.col2 and a.col3 = b.col3 and a.col3 = b.col4 ) where exists (select 1 from tab b where a.col2 = b.col2 and a.col3 = b.col3 and a.col3 = b.col4 ) Note: In Method 2 the sub-query must return only 1 row.

set (col1,col7,col8) = (select -1, col7,col8 from tab b where a.col2 = b.col2 and a.col3 = b.col3 and a.col3 = b.col4 ) Don" id="ctl00_m_m_i_ctl00_gr_ctl05_bestanswerbody" class="textarea-bestanswerhidden" name="bestanswerbody" answerbody Id="5190407" / Method 1: update tab a set col1 = -1 where exists (select 1 from tab b where a.col2 = b.col2 and a.col3 = b.col3 and a.col3 = b.col4 ) Method 2: update tab a set (col1,col7,col8) = (select -1, col7,col8 from tab b where a.col2 = b.col2 and a.col3 = b.col3 and a.col3 = b.col4 ) where exists (select 1 from tab b where a.col2 = b.col2 and a.col3 = b.col3 and a.col3 = b.col4 ) Note: In Method 2 the sub-query must return only 1 row.

These statements do not implicitly commit the current transaction. Manager’, ’8-aug-1998’,2000); If you want to add a new row by supplying values for some columns not all the columns then you have to mention the name of the columns in insert statements.

The following are the DML statements available in Oracle. For example the following statement inserts row in emp table by supplying values for empno, ename, and sal columns only. Insert into emp (empno,ename,sal) values (102,’Ashi’,5000); Suppose you want to add rows from one table to another i.e.

We’ll briefly explore both options so you can find what works best for you.

updating a table from another table in oracle-54

To achieve the above we can give a multi table INSERT statement given below Insert all Into week_sales(prodid,prodname,weekday,amount) Values (prodid,prodname,’Mon’,mon_amt) Into week_sales(prodid,prodname,weekday,amount) Values (prodid,prodname,’Tue’,tue_amt) Into week_sales(prodid,prodname,weekday,amount) Values (prodid,prodname,’Wed’,wed_amt) Into week_sales(prodid,prodname,weekday,amount) Values (prodid,prodname,’Thu’,thu_amt) Into week_sales(prodid,prodname,weekday,amount) Values (prodid,prodname,’Fri’,fri_amt) Into week_sales(prodid,prodname,weekday,amount) Values (prodid,prodname,’Sat’,sat_amt) Select prodid,prodname,mon_amt,tue_amt,wed_amt,thu_amt Fri_amt,sat_amt from sales; Update statement is used to update rows in existing tables which is in your own schema or if you have update privilege on them.select * from student; ID NAME SCORE ---------- --------------- ---------- 1 Jack 540 2 Rose 3 William 650 4 Caledon 620 5 Fabrizio 600 6 Thomas 7 Ruth 690 11 Brock 705 10 Lizzy 9 Wallace 600 8 Spicer 620 11 rows selected. But it does not work with a merge query (probably because of the update part): “Missing IN or OUT parameter at index:: 1” Would would you advise to retrieve the value of a field (typically an id) of the row that has been inserted or updated?select * from student; ID NAME SCORE ---------- --------------- ---------- 1 Jack 540 2 Rose 3 William 650 4 Caledon 620 5 Fabrizio 600 6 Thomas 7 Ruth 690 11 Brock 705 10 Lizzy 9 Wallace 600 8 Spicer 620 11 rows selected. Thanks, Hi egavaldo, MERGE doesn’t support the RETURNING clause and going by this Ask Tom thread, the feature isn’t likely to be available anytime soon.The basic format is: Let's go back to the AUTHOR table and look at some examples of Oracle updates.As with the INSERT section, I rolled back the changes to the original table.In place of 3 separate unwieldy INSERT, UPDATE and DELETE statements with conditional sub-queries, the all-in-one MERGE does the job in one shot.