语句中的 HSQL 意外标记

Question

我在 LibreOffice Base 中创建了一个简单的数据库，其中 table 很少。我想运行以下查询：

SELECT SUM( "Total price" ) AS "Expenses" FROM "Expenses" WHERE "the Name of the Ware" IS 'food' AND "Date" BETWEEN {d '2019-08-06' } AND {d '2019-08-20' }

但是我得到一个错误：

SQL state: 37000 Errorcode: -11

Unexpected token in statement [SELECT SUM( "Total price" ) AS "Expenses" FROM "Expenses" WHERE "the Name of the Ware" IS 'food' AND "Date" BETWEEN '2019-08-06' AND '2019-08-20' ]

如您所见，我正在尝试从费用 table 的记录中获取 "Total price" 值的总和，其中 "the Name of the Ware" 是 'food'，日期介于两者之间两个给定的日期。

我怎样才能实现我的目标？

Answer 1

IS 关键字仅用于 NULL 和 TRUE 或 FALSE 表达式，例如 IS NULL 或 IS TRUE

您需要改用等号：

SELECT SUM( "Total price" ) AS "Expenses" FROM "Expenses" WHERE "the Name of the Ware" = 'food' AND "Date" BETWEEN {d '2019-08-06' } AND {d '2019-08-20' }

语句中的 HSQL 意外标记

HSQL unexpected token in statement

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