sql 批量更新语句，可用于大量修改

UPDATE tableName  SET `_a` = CASE  table  WHEN `_id` = "1"  and `_b`="2" THEN "这是说明将id为1的a的字段改为此字段"tab  WHEN `_id` = "2"  and `_b`="2"  THEN "这是说明将id为2的a的字段改为此字段" ab  WHEN `_id` = "3"  and `_b`="2"  T

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