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DROP TABLE A_bak 


Create table A_bak Select * from A


ALTER TABLE A_merged ADD INDEX rownum (rownum); 


ALTER TABLE A ADD INDEX rownum (rownum);


delete from A_merged where top1 is NULL;


delete from A where top1 is NULL;


INSERT INTO A (select * from (SELECT a.* FROM A_merged a LEFT JOIN A b ON a.rownum = b.rownum WHERE b.rownum IS NULL) c); 


DROP TABLE A_merged 


RENAME TABLE A TO A_merged 


Create table A Select * from A_merged WHERE 0=1; 


 


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INSERT INTO A (select * from (SELECT a.* FROM A_merged a LEFT JOIN A b ON a.rownum = b.rownum WHERE b.rownum IS NULL) c); 


 


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01-14 19:10
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