Android SQLite MINUS查询

Question

我正在尝试使用查询中的值初始化游标。该查询旨在返回表2中不在表2中的内容。为此，我使用了return db.rawQuery("select _id, ingredient_name, measurement, unit from ingredients where recipe_code = " + recipe_code + " MINUS select ingredient_name, measurement, unit from kitchen", null); 子句，但它似乎没有工作，我看不出我出错的地方。

查询

02-05 11:35:05.189 29028-29028/com.example.rory.prototypev2 E/AndroidRuntime: android.database.sqlite.SQLiteException: near "MINUS": syntax error (code 1): , while compiling: select _id, ingredient_name, measurement, unit from ingredients where recipe_code = 11 MINUS select ingredient_name, measurement, unit from kitchen

错误

addEventListener

Answer 1

您可以使用EXCEPT子句。在sqlite中支持。在Docs中，我找不到用于sqlite的MINUS

select _id, ingredient_name, measurement, unit from ingredients where recipe_code = " + recipe_code + " EXCEPT select ingredient_name, measurement, unit from kitchen"

感谢。

Answer 2

SQLite中没有这样的运算符。 SQLite Expressions