az sql --help Manage Azure SQL Databases and Data Warehouses.

addaxnasom

Group
    az sql : Manage Azure SQL Databases and Data Warehouses.

Subgroups:
    db                      : Manage databases.
    dw                      : Manage data warehouses.
    elastic-pool            : Manage elastic pools.
    failover-group          : Manage SQL Failover Groups.
    instance-failover-group : Manage SQL Instance Failover Groups.
    mi                      : Manage SQL managed instances.
    midb                    : Manage SQL managed instance databases.
    server                  : Manage SQL servers.
    virtual-cluster         : Manage SQL virtual clusters.
    vm            [Preview] : Manage SQL virtual machines.

Commands:
    list-usages             : Gets all subscription usage metrics in a given location.
    show-usage              : Gets a subscription usage metric.