Sql 使用select query data MS Access更新特定表列

我使用MS Access 2019，有两个表：

• 表a（标识a，编号a）
• 表b（id、名称）

此

UPDATE

语句不起作用：

UPDATE table_a
SET number_a = (SELECT COUNT(*) FROM table_b WHERE id_b IN (1,3) AND name_b=@name) 
WHERE id_a=1;

错误

操作必须使用可更新的查询

---

为什么不捕获值，然后按如下方式分配它

DECLARE @COUNT_B INT
SELECT @COUNT_B = COUNT(*) FROM table_b WHERE id_b IN (1,3) GROUP BY id_b

UPDATE table_a
SET number_a = @COUNT_B
WHERE id_a=1;

或

---

取决于什么是

@name

，它在哪里定义，以及如何用它的值替换它。

这是否回答了您的问题？这不是MS Access的有效语法。

UPDATE table_a 
SET table_a.number_a = DCount("*","table_b","id_b IN (1,3) AND name_b=@name")
WHERE table_a.id_a=1;

UPDATE table_a 
SET table_a.number_a = DCount("*","table_b","id_b IN (1,3) AND name_b=" & @name)
WHERE table_a.id_a=1;