you could copy the data out and then restore it with something like this...
note, if you have triggers or constraints this may not be appropriate
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Question
ORACLE -- reduce "column size"
I have a NUMBER(8) column that
has only three digit numbers in it.
How can I do something like the below
to make the MAST_ID column smaller without
having to do alot of manually work ?
ALTER TABLE GML_P_COMPONENTS
CHANGE MAST_ID column to NUMBER(6)
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Answers
1. Create a table containing the values for insertion: create table GML_P_COMPONENTS_TEMP as select rowid altrowid, mast_id from GML_P_COMPONENTS;
2. Alter the table to allow nulls in mast_id , set the values to null then change the length: alter table GML_P_COMPONENTS modify (mast_id null);
OR
update GML_P_COMPONENTS set mast_id e = null;
alter table GML_P_COMPONENTS (mast_id NUMBER(6));
3. Now repopulate the column and get rid of the temporary table:
update GML_P_COMPONENTS set mast_id = (select mast_id from GML_P_COMPONENTS_TEMP where altrowid = GML_P_COMPONENTS .rowid);
drop table GML_P_COMPONENTS_TEMP ;
Below are the steps I did:
1. disable "mast_id" PK and FKs to parent and child tables
2. run below
3. enable "mast_id" PK and FKs to parent and child tables
--------------------------
CREATE TABLE temp_data
AS
SELECT ROWID rid, mast_id FROM gml_p_components;
COMMIT;
--------------------------
UPDATE gml_p_components
SET mast_id = NULL;
--------------------------
ALTER TABLE gml_p_components MODIFY (mast_id NUMBER(6));
--------------------------
UPDATE gml_p_components g
SET mast_id =
(SELECT mast_id
FROM temp_data
WHERE rid = g.ROWID);
COMMIT;
--------------------------
drop TABLE temp_data;
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by: sdstuberPosted on 2009-10-22 at 08:48:28ID: 25635594
the syntax would be
alter table gml_p_components modify (mast_id number(6))
but the column must be empty (all null) to decrease the precision