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我不知道如何執行一個查詢來選擇field_x（minus）field_y小於等於的位置？MySQL Query where where Field_x`` Field_y` is lower than equal
樣品：SELECT * FROM $tableName WHERE Field_X - Fiel_Y < 50
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回答
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根據您的問題，這應該是它
SELECT * FROM tableName WHERE Field_X - Field_Y <= 50
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你的意思是低於或等於比一些常數？
SELECT * FROM $tableName WHERE Field_X - Field_Y <= 50
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你是什麼意思「低於平等」？ –