sqlite JOIN query for multiple entries

问题

My database has "diary" table and "food" table. In diary table I have following columns: date, food1,food2, ...food10. In food table I have: id, name, allergen1, allergen2, allergen3. So basically you log up to 10 foods a day to diary. Now I'm trying to build a query which would let me find last date that I've eaten food with allergen3. So that's the query I came up with, which you probably know is not working ;-)

    Cursor findDateRes = db.rawQuery("SELECT date(" + DIARY_COL_DATE + ") FROM " + DIARY_TABLE
            + " INNER JOIN " + FOOD_TABLE + " food1 ON (food1." + FOOD_COL_1 + " = " + DIARY_TABLE + "." + DIARY_COL_F1 + ")"
            + " INNER JOIN " + FOOD_TABLE + " food2 ON (food2." + FOOD_COL_1 + " = " + DIARY_TABLE + "." + DIARY_COL_F2 + ")"
            + " INNER JOIN " + FOOD_TABLE + " food3 ON (food3." + FOOD_COL_1 + " = " + DIARY_TABLE + "." + DIARY_COL_F3 + ")"
            + " INNER JOIN " + FOOD_TABLE + " food4 ON (food4." + FOOD_COL_1 + " = " + DIARY_TABLE + "." + DIARY_COL_F4 + ")"
            + " INNER JOIN " + FOOD_TABLE + " food5 ON (food5." + FOOD_COL_1 + " = " + DIARY_TABLE + "." + DIARY_COL_F5 + ")"
            + " INNER JOIN " + FOOD_TABLE + " food6 ON (food6." + FOOD_COL_1 + " = " + DIARY_TABLE + "." + DIARY_COL_F6 + ")"
            + " INNER JOIN " + FOOD_TABLE + " food7 ON (food7." + FOOD_COL_1 + " = " + DIARY_TABLE + "." + DIARY_COL_F7 + ")"
            + " INNER JOIN " + FOOD_TABLE + " food8 ON (food8." + FOOD_COL_1 + " = " + DIARY_TABLE + "." + DIARY_COL_F8 + ")"
            + " INNER JOIN " + FOOD_TABLE + " food9 ON (food9." + FOOD_COL_1 + " = " + DIARY_TABLE + "." + DIARY_COL_F9 + ")"
            + " INNER JOIN " + FOOD_TABLE + " food10 ON (food10." + FOOD_COL_1 + " = " + DIARY_TABLE + "." + DIARY_COL_F10 +
            ") WHERE 1 NOT IN (food1." + FOOD_COL_5 +
            ",food2." + FOOD_COL_5 +
            ",food3." + FOOD_COL_5 +
            ",food4." + FOOD_COL_5 +
            ",food5." + FOOD_COL_5 +
            ",food6." + FOOD_COL_5 +
            ",food7." + FOOD_COL_5 +
            ",food8." + FOOD_COL_5 +
            ",food9." + FOOD_COL_5 +
            ",food10." + FOOD_COL_5 +
            ") ORDER BY date(" + DIARY_COL_DATE + ") ASC LIMIT 1", null);

"FOOD_COL_1" stands for id and "FOOD_COL_5" stands fro allergen3.

Thank you for looking. Any input will be appreciated.

来源：https://stackoverflow.com/questions/45651712/sqlite-join-query-for-multiple-entries

标签

java

android

sqlite

android-sqlite