同一张表中，假设以两个字段做唯一业务,这两个字段分别为key1，key2,
则以这两个字段为唯一
- DELETE tablename FROM
- tablename ,
- (
- SELECT
- min(id) id,
- key1, key2
- FROM
- tablename
- GROUP BY
- key1, key2
- HAVING
- count(*) > 1
- ) t2
- WHERE
- tablename .key1=t2.key1
- AND tablename .key2=t2.key2
- AND tablename .id > t2.id;
增加唯一索引
- ALTER TABLE t_procurement_order_instock add unique index uniq_t_procurement_order_instock(`t_procurement_order_instock_id`);
ALTER TABLE tablename- DROP INDEX ix_instock_date_warehouse_g_f_lu_standard_item,
- ADD INDEX idx_f_lu_standard_item_warehouse_g_item_status_instock_date(`f_lu_standard_item`,`warehouse_g`,`item_status`,`instock_date`);
- ALTER TABLE tablename
- DROP INDEX IND_PAY_ORDER_1;
- ALTER IGNORE TABLE PAY_ORDER ADD UNIQUE INDEX IND_PAY_ORDER_1(ORDER_ID); 将ORDER_ID设为唯一索引（IND_PAY_ORDER_1）删除重复数据
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