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如何返回第一次出现的“行号”,SQL?

sqlite3 sqlite database-design database sql

0

T.T.T. · 技术社区 · 15 年前

                         (row number not stored in db)

------------------------
|      |     A   |     | (1)
------------------------
|      |     B   |     | (2)
------------------------
|      |     C   |     | (3)
------------------------ -----Page 1
|      |     D   |     | (4)
------------------------
|      |     E   |     | (5)
------------------------
|      |     F   |     | (6)
------------------------ -----Page 2
|      |     F   |     | (7)
------------------------
|      |     F   |     | (8)
------------------------
|      |     G   |     | (9) -----Page 3

谢谢您。

试着做第一部分: How do I query a SQL database to return the first "page" containing the specified data?

sequential row numbers from query

sqlite Retrieve Rownumber in sqlite

2 回复 | 直到 9 年前

1

Jasper 15 年前

SELECT COUNT(*)
FROM tbl
WHERE letter < 'F'

(你会得到一个减一的数字,所以之后你必须增加一)

2

0

Tim Li 15 年前

试试这个,但我不考虑性能

--create table
create table t(letter char(1))
go

--insert values
BEGIN TRAN
INSERT INTO t VALUES ('A')
INSERT INTO t VALUES ('B')
INSERT INTO t VALUES ('C')
INSERT INTO t VALUES ('D')
INSERT INTO t VALUES ('E')
INSERT INTO t VALUES ('F')
INSERT INTO t VALUES ('F')
INSERT INTO t VALUES ('F')
INSERT INTO t VALUES ('G')
COMMIT TRAN
GO

--and then try the select what you want
DECLARE @temp table(num int identity(1,1), letter char(1))

--use a temp table variable to store the data with row number
insert into @temp
SELECT * FROM t

--select the value
SELECT * FROM @temp WHERE letter = 'F'
GO

--drop the table finally
drop table t
GO