ALTER IGNORE
TABLE tbl_DuplicateEmployee_VarcharDatatype
ADD UNIQUE INDEX idx_tbl_DuplicateEmployee_VarcharDatatype
(EmpID,EmpName);

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘IGNORE
TABLE tbl_DuplicateEmployee_VarcharDatatype
ADD UNIQUE INDEX idx_tbl_Dup’ at line 1

How to delete the duplicate data in mysql workbench.There are 6 lakhs above data in the table. I have used below query for delete but it shows Lost connection to Mysql Server during query. can you please send the query or explain how to solve problem.

SET SQL_SAFE_UPDATES=0;
DELETE t1 FROM PumpErrorLog t1
INNER JOIN PumpErrorLog t2
WHERE
t1.id < t2.id AND
t1.device_id = t2.device_id AND
t1.side = t2.side AND
t1.event_date = t2.event_date AND
t1.data_source = t2.data_source AND
t1.code= t2.code AND
t1.level= t2.level AND
t1.description= t2.description AND
t1.pump_number= t2.pump_number AND
t1.TimeStamp= t2.TimeStamp AND
t1.report_time= t2.report_time AND
t1.s3logfile= t2.s3logfile AND
t1.board_timestamp= t2.board_timestamp ;

Please explain a bit more about below queries.

what does this query :
SET SESSION old_alter_table=1;

ALTER IGNORE
TABLE Employee.tbl_DuplicateEmployee_VarcharDatatype
ADD UNIQUE INDEX idx_tbl_DuplicateEmployee_VarcharDatatype
(EmpID,EmpName);

Thanks