This category will hold examples for Oracle SQL.
I had to rename a column in a table in an oracle database.
Unfortunately the oracle documentation was not working for me and I had to play around a bit and search the internet until I found the following syntax to be working.
alter table tableName rename column oldName to newName;
Some things to watch out for.
You have to use simple column names.
The oracle documentation listed as first result in a google search provided the following example, which did not work for me.
RENAME COLUMN EMPLOYEE.MANAGER TO SUPERVISOR
I am puzzled as to why the above syntax did not work for me while the alter table statement worked fine, since I was able to create the table in the first place
It looks as if I just misinterpreted the oracle documentation and the rename statement always has to be combined with an alter table statement.
Another resource using a syntax, which worked for me.
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Oracle is able to join tables using the LIKE opertaor.
a_Table.a_Field LIKE '%' || b_Table.b_Field || '%';
The LIKE oprator works in combination with wildcards ('%').
The above SQL will work fine for text based data types like varchar. I've never tested it for other data types.
Then on the contrary: Would it make sence to join other types than text based types using LIKE? Most likely not.
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Recently I had to create some tables in Oracle and fill them with data from other tables for testing.
It is quite easy to create and modify tables, however it can be a pain digging through undocumented dependencies, table constraints which describe parent child relationships between tables.
In order to find foreign keys for a table, adjust below query by replacing 'table_name' with the name of a table of interest and execute.
Synonym 'a' is holding the child table details and synonym 'uc' is holding the parent table details.
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