Minimum Database version for APEX

See MOS Note:1344948.1: Application Express (APEX) Database and Web Server Certification Reference:

    For APEX 4.0, the minimum database version is 10.2.0.3
    For APEX 5.0, the minimum database version is 11.1.0.7
    For APEX 5.1, the minimum database version is 11.2.0.4
    For APEX 18.1, 18.2, 19.1, 20.1, 20.2 the minimum database version is 11.2.0.4
    For APEX 21.1 the minimum database version is 12.1.0.2

Minimum APEX version per Database

See MOS Note:1344948.1: Application Express (APEX) Database and Web Server Certification Reference:

    For Oracle Database 11.1.0.x, the minimum APEX version is 3.0.
    For Oracle Database 11.2.0.x, the minimum APEX version is 3.2.1
    For Oracle Database 12.1.0.2, the minimum APEX version is 4.2.5
        For usage with Oracle Multitenant, APEX 4.2.3 or newer must be installed
    For Oracle Database 12.2.0.1, the minimum APEX version is 5.0.4
    For Oracle Database 18c, the minimum APEX version is 5.1.3
    For Oracle Database 19c, the minimum APEX version is 18.2
    For Oracle Database 21c, the minimum APEX version is 20.1