Rails | SQL在哪裏日期時間和日期

Question

我想獲取本地數據庫上的記錄。

我的列從&到dateranges，我想將日期範圍轉換爲日期以查找記錄。 date = Date.parse(2017-02-17) sc = schedules.where("from <= ? AND to >= ?",date,date)給出錯誤;

SELECT "schedule_days".* FROM "schedule_days" WHERE "schedule_days"."car_id" = ? AND (from <= '2017-02-17' AND to >= '2017-02-17') [["car_id", 2]] SQLite3::SQLException: near "from": syntax error: SELECT "schedule_days".* FROM "schedule_days" WHERE "schedule_days"."car_id" = ? AND (from <= '2017-02-17' AND to >= '2017-02-17') ActiveRecord::StatementInvalid: SQLite3::SQLException: near "from": syntax error: SELECT "schedule_days".* FROM "schedule_days" WHERE "schedule_days"."car_id" = ? AND (from <= '2017-02-17' AND to >= '2017-02-17')

這是問題，因爲從&到有日期時間？我也試過了;

schedules.where("date(from) <= ? AND date(to) >= ?",date,date)沒有運氣。然後，我會將此代碼推送到heroku postgresql

Answer 1

FROM是SQL中的保留字。這可能是因爲解析器沒有意識到您引用了表中的列而未使用FROM關鍵字。

您是否已嘗試使用不同的變量名稱或別名？