我感兴趣的是从数据库表中选择第n行的一些(理想的)数据库不可知的方法。看看如何使用以下数据库的本机功能来实现这一点也很有趣:

SQL Server MySQL PostgreSQL SQLite 甲骨文

我目前正在SQL Server 2005中做以下事情,但我有兴趣看到其他更不可知论的方法:

WITH Ordered AS (
SELECT ROW_NUMBER() OVER (ORDER BY OrderID) AS RowNumber, OrderID, OrderDate
FROM Orders)
SELECT *
FROM Ordered
WHERE RowNumber = 1000000

以上SQL: Firoz Ansari的Weblog的功劳

更新:参见Troels Arvin关于SQL标准的回答。Troels,你有我们可以引用的链接吗?


当前回答

我不确定其他的,但我知道SQLite和MySQL没有任何“默认”行排序。至少在这两种方言中,下面的代码片段从the_table中抓取了第15个条目,按添加的日期/时间排序:

SELECT * 
FROM the_table 
ORDER BY added DESC 
LIMIT 1,15

(当然,您需要添加一个DATETIME字段,并将其设置为条目添加的日期/时间…)

其他回答

难以置信,你能找到一个SQL引擎执行这个…

WITH sentence AS
(SELECT 
    stuff,
    row = ROW_NUMBER() OVER (ORDER BY Id)
FROM 
    SentenceType
    )
SELECT
    sen.stuff
FROM sentence sen
WHERE sen.row = (ABS(CHECKSUM(NEWID())) % 100) + 1

1个小变化,n-1而不是n。

select *
from thetable
limit n-1, 1
SELECT
    top 1 *
FROM
    table_name
WHERE
    column_name IN (
        SELECT
            top N column_name
        FROM
            TABLE
        ORDER BY
            column_name
    )
ORDER BY
    column_name DESC

我写这个查询是为了求第n行。 使用此查询的示例如下

SELECT
    top 1 *
FROM
    Employee
WHERE
    emp_id IN (
        SELECT
            top 7 emp_id
        FROM
            Employee
        ORDER BY
            emp_id
    )
ORDER BY
    emp_id DESC

下面是我最近为Oracle编写的一个sproc的通用版本,它允许动态分页/排序——HTH

-- p_LowerBound = first row # in the returned set; if second page of 10 rows,
--                this would be 11 (-1 for unbounded/not set)
-- p_UpperBound = last row # in the returned set; if second page of 10 rows,
--                this would be 20 (-1 for unbounded/not set)

OPEN o_Cursor FOR
SELECT * FROM (
SELECT
    Column1,
    Column2
    rownum AS rn
FROM
(
    SELECT
        tbl.Column1,
        tbl.column2
    FROM MyTable tbl
    WHERE
        tbl.Column1 = p_PKParam OR
        tbl.Column1 = -1
    ORDER BY
        DECODE(p_sortOrder, 'A', DECODE(p_sortColumn, 1, Column1, 'X'),'X'),
        DECODE(p_sortOrder, 'D', DECODE(p_sortColumn, 1, Column1, 'X'),'X') DESC,
        DECODE(p_sortOrder, 'A', DECODE(p_sortColumn, 2, Column2, sysdate),sysdate),
        DECODE(p_sortOrder, 'D', DECODE(p_sortColumn, 2, Column2, sysdate),sysdate) DESC
))
WHERE
    (rn >= p_lowerBound OR p_lowerBound = -1) AND
    (rn <= p_upperBound OR p_upperBound = -1);

这就是我在DB2 SQL中如何做的,我相信RRN(相对记录号)由O/S存储在表中;

SELECT * FROM (                        
               SELECT RRN(FOO) AS RRN, FOO.*
               FROM FOO                         
               ORDER BY RRN(FOO)) BAR             
WHERE BAR.RRN = recordnumber