33 lines
1.7 KiB
SQL
33 lines
1.7 KiB
SQL
-- 回填 mch_manage.discounts_rate：
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-- 从 discounts_price 文案（如"享9.5折"、"享菜品7.8折（不含酒水）"、"全场95折"）中提取"折"前面的数字，
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-- 折算规则与 discounts_rate 语义(1-99，10=1折)一致：
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-- 小数或个位整数("9.5折"->95、"9折"->90、"0.5折"->5) 乘以10；
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-- 两位整数("95折")本身即百分比，保持原值 -> 95。
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-- 仅填充 discounts_rate 为空的行，已配置的值不覆盖；提取不到"数字+折"或折算结果不在 1-99 的行跳过。
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-- ① 预览：执行前先跑这条，人工确认折算结果
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SELECT id, name, discounts_price,
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ROUND(CAST(REPLACE(REGEXP_SUBSTR(discounts_price, '[0-9]+(\\.[0-9]+)?折'), '折', '') AS DECIMAL(10, 2))
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* IF(CAST(REPLACE(REGEXP_SUBSTR(discounts_price, '[0-9]+(\\.[0-9]+)?折'), '折', '') AS DECIMAL(10, 2)) < 10, 10, 1)) AS will_rate
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FROM mch_manage
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WHERE discounts_rate IS NULL
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AND discounts_price REGEXP '[0-9]+(\\.[0-9]+)?折';
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-- ② 执行回填
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UPDATE mch_manage m
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JOIN (SELECT id,
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ROUND(CAST(REPLACE(REGEXP_SUBSTR(discounts_price, '[0-9]+(\\.[0-9]+)?折'), '折', '') AS DECIMAL(10, 2))
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* IF(CAST(REPLACE(REGEXP_SUBSTR(discounts_price, '[0-9]+(\\.[0-9]+)?折'), '折', '') AS DECIMAL(10, 2)) < 10,
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10, 1)) AS rate
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FROM mch_manage
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WHERE discounts_rate IS NULL
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AND discounts_price REGEXP '[0-9]+(\\.[0-9]+)?折') t ON t.id = m.id
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SET m.discounts_rate = t.rate
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WHERE t.rate BETWEEN 1 AND 99;
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-- ③ 核对：回填结果与原文对照
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SELECT id, name, discounts_price, discounts_rate
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FROM mch_manage
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WHERE discounts_rate IS NOT NULL
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ORDER BY update_time DESC;
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