MySQL’s EXPLAIN PLAN
 
 
- To generate a plan:
- 
EXPLAIN SELECT tt.TicketNumber, tt.TimeIn,
 
 tt.ProjectReference, tt.EstimatedShipDate,
 tt.ActualShipDate, tt.ClientID,
 tt.ServiceCodes, tt.RepetitiveID,
 tt.CurrentProcess, tt.CurrentDPPerson,
 tt.RecordVolume, tt.DPPrinted, et.COUNTRY,
 et_1.COUNTRY, do.CUSTNAME
 FROM tt, et, et AS et_1, do
 WHERE tt.SubmitTime IS NULL
 AND tt.ActualPC = et.EMPLOYID
 AND tt.AssignedPC = et_1.EMPLOYID
 AND tt.ClientID = do.CUSTNMBR;
 
- The plan is described using results like this: 
- 
TABLE TYPE   POSSIBLE_KEYS                KEY      KEY_LEN REF            ROWS  EXTRA
 
 et    ALL    PRIMARY                      NULL     NULL    NULL           74
 tt    ref    AssignedPC,ClientID,ActualPC ActualPC 15      et.EMPLOYID    52    where used
 et_1  eq_ref PRIMARY                      PRIMARY  15      tt.AssignedPC  1
 do    eq_ref PRIMARY                      PRIMARY  15      tt.ClientID    1