如何INSERT到从另一个表中提取的表记录

Question

我正在尝试编写一个查询,从表中提取和转换数据,然后将这些数据插入另一个表.是的,这是一个数据仓库查询,我在MS Access中这样做.所以基本上我想要一些像这样的查询:

INSERT INTO Table2(LongIntColumn2, CurrencyColumn2) VALUES
  (SELECT LongIntColumn1, Avg(CurrencyColumn) as CurrencyColumn1 FROM Table1 GROUP BY LongIntColumn1);

我试过但得到语法错误消息.

如果你想这样做,你会怎么做？

Answer 1

没有"价值",没有括号:

INSERT INTO Table2(LongIntColumn2, CurrencyColumn2)
SELECT LongIntColumn1, Avg(CurrencyColumn) as CurrencyColumn1 FROM Table1 GROUP BY LongIntColumn1;

Answer 2

您有两种语法选项:

选项1

CREATE TABLE Table1 (
    id int identity(1, 1) not null,
    LongIntColumn1 int,
    CurrencyColumn money
)

CREATE TABLE Table2 (
    id int identity(1, 1) not null,
    LongIntColumn2 int,
    CurrencyColumn2 money
)

INSERT INTO Table1 VALUES(12, 12.00)
INSERT INTO Table1 VALUES(11, 13.00)

INSERT INTO Table2
SELECT LongIntColumn1, Avg(CurrencyColumn) as CurrencyColumn1 FROM Table1 GROUP BY LongIntColumn1

选项2

CREATE TABLE Table1 (
    id int identity(1, 1) not null,
    LongIntColumn1 int,
    CurrencyColumn money
)

INSERT INTO Table1 VALUES(12, 12.00)
INSERT INTO Table1 VALUES(11, 13.00)


SELECT LongIntColumn1, Avg(CurrencyColumn) as CurrencyColumn1
INTO Table2
FROM Table1
GROUP BY LongIntColumn1

请记住,选项2将创建一个只包含投影列(SELECT上的列)的表.

Answer 3

删除VALUES和括号.

INSERT INTO Table2 (LongIntColumn2, CurrencyColumn2)
SELECT LongIntColumn1, Avg(CurrencyColumn) FROM Table1 GROUP BY LongIntColumn1

Answer 4

VALUES从SQL中删除.

Answer 5

我相信你在这个例子中的问题是"值"关键字.只插入一行数据时使用"values"关键字.要插入选择的结果,您不需要它.

另外,你真的不需要围绕select语句的括号.

来自msdn:

多记录追加查询:

INSERT INTO target [(field1[, field2[, …]])] [IN externaldatabase]
SELECT [source.]field1[, field2[, …]
FROM tableexpression

单记录追加查询:

INSERT INTO target [(field1[, field2[, …]])]     
VALUES (value1[, value2[, …])