![]() ![]() If you just want a copy of a schema - table by table, column by column - exp/imp is the way to go using fromuser touser, or datapump - depending on your version. ) Sometimes, we find that a piece of data that we did not maintain becomes important, and we need to add a new table column to the database. custsex char (1) NOT NULL, custcreditrating number. This is not very clear at all - especially when you throw in #2. Here is an example of Oracle 'alter table' syntax to add multiple data columns. I would say that data pump or export import would be the path of least resistance - either one can remap schema names - but you would start with an EMPTY schema. To make it simple, lets consider a prod alike schema needs to be created.Ī prod alike? or do you mean a "prod like schema" Laughing out loud - I'm not sure what should happen in your mind when this occurs. Below is the syntax for using Alter Table statement with Add clause: ALTER TABLE ADD constraint Here are the top 3 things you should know before adding a new column to an existing table: Column name and Data type: Please be informed about the column name and its data type.Happens with this COPY command if you have tables in both schema but different I need Objects in Schema B are same as Schema B. ![]() Table is present in both schemas but differ in column structure."Ī simple copy ? the structures are different - that is hugely complex all of a sudden. Be prepared for some downtime, or use DBMS_REDEFINITION."2. If the table volume is large this is going to be a big operation. This has no impact on the way the table gets queried, but if you still want to add table column at a specific position, the approach demonstrated above will do it for you. In Oracle, the standard command to add a new column appends the new column to the very end of the table. ![]() If you must have the table up and running while the new column is added, consider using the DBMS_REDEFINITION package. This approach works well for tables with small data volume or those that can take some downtime.
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