Question

SQL Server 2005数据库。我有一个包含许多记录的临时表，这些记录来自RSS提要，需要定期插入。有些数据会改变，有些数据会保持不变。我只需要插入“新”记录，并消除插入冗余数据的可能性，从而导致重复记录。我该如何做到这一点？

示例，tempTable，

        BEGIN
            INSERT INTO myTable
                (
                    row1
                    ,row2
                    ,row3
                )
            SELECT
                row1
                ,row2
                ,row3
            FROM @tempTable
        END

Answer 1

一种方法是not exists子查询：

INSERT  myTable
        (row1, row2, row3)
SELECT  row1, row2, row3
FROM    @tempTable temp
WHERE   NOT EXISTS
        (
        SELECT  *
        FROM    myTable
        WHERE   row1 = temp.row1
                and row2 = temp.row2
                and row3 = temp.row3
        )

Answer 2

试试这个：

con.Open();
SqlCommand cmd = new SqlCommand("If Not Exists(select * from stholidays where holiday='"+ dd + "') begin insert into stholidays values('" + dateTimePicker12.Text + "','" + dateTimePicker20.Text + "','" + dateTimePicker13.Text + "','" + mbk + "','" + dateTimePicker14.Text + "','" + dateTimePicker15.Text + "','" + lt + "','" + dateTimePicker16.Text + "','" + dateTimePicker17.Text + "','" + ebk + "','" + dateTimePicker18.Text + "','" + dateTimePicker19.Text + "','" + textBox105.Text + "','" + textBox106.Text + "','" + textBox107.Text + "','" + dd + "','" + textBox104.Text + "')end", con);
cmd.ExecuteNonQuery();
con.Close();

如果不存在，则插入记录SQL Server 2005

2 个答案: