[Oracle] DESCRIBE Command to Check Table Definition

Oracle DESCRIBE plus the equivalent table-definition commands for MySQL and PostgreSQL.

[Oracle] Roles of Wildcard Characters - Percent (%) and Underscore (_)

A memo on Oracle's LIKE wildcards: % for any run of characters and _ for a single one.

[Oracle] Displaying Table List

Listing user tables in Oracle, MySQL, and PostgreSQL, side by side.

[Oracle] How to Resolve ORA-12505, TNS:listener does not currently know of SID given in connect descriptor Error

Fixing the ORA-12505 TNS listener error by restarting the listener and Oracle instance.

[Oracle] Automatic Sequential Number Generation Method

Using Oracle sequence objects with NEXTVAL / CURRVAL for auto-numbering.