IF EXISTS (SELECT * FROM SYSINDEXES WHERE NAME='IX_factory_qrcode_old_dh')--檢測是否已經存在IX_TEST_TNAME索引
DROP INDEX factory_qrcode_old.IX_factory_qrcode_old_dh--如果存在則刪除
--創建索引
CREATE NONCLUSTERED INDEX IX_factory_qrcode_old_dh --創建一個非聚集索引
ON factory_qrcode_old(danhao) --為TEST表的TNAME字段創建索引