Question

以下是我的查询代码，其中我目前只传递了8个产品的ID，这些产品存在于100个记录的数据库表中。

String query = "SELECT productId IN (" + makePlaceholders(ids.length)+"),"+ " * FROM " + tableName + " WHERE type LIKE 'percent'"
                            + " UNION ALL "
                            + "SELECT productId IN (" + makePlaceholders(ids.length)+"),"+ " * FROM " + tableName + " WHERE type LIKE 'currency' ORDER BY cash DESC";
                    cursor = dataBase.rawQuery(query, ids);

我的问题是，它显示了所有记录（即所有100条记录），而不仅仅是我使用IN子句从ID传递的那8条记录。我希望这8条记录（或者在函数中传递的更多记录）以现金显示ORDER。

现在我应该如何编写此查询以实现我的目标。

修改我只为此目的使用一张桌子。

Answer 1

我从未见过像这样的SQL：

SELECT productId IN (..) from ... where ....

我希望看到

SELECT productId from ... where productId IN (..) and ....

Answer 2

将IN移至WHERE子句，如下所示。

String query = "SELECT * FROM " + tableName + " WHERE type LIKE 'percent' AND " productId IN (" + makePlaceholders(ids.length)+"),"+ "
                            + " UNION ALL "
                            + "SELECT * FROM " + tableName + " WHERE type LIKE 'currency' AND productId IN (" + makePlaceholders(ids.length)+"),"+ " ORDER BY cash DESC";
                    cursor = dataBase.rawQuery(query, ids);

Android Sqlite Query联合所有

2 个答案: