how can i select 1,4,7,10,13,... numbered records from table [closed]

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 ID NAME  开发者_运维问答                      AGE     DEPTNO     SALARY

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  1 shasank                      25         11       2025
  2 raju                         27         12       2027
  3 son                          33         12       2131
  6 bali                         31         10       2031
  4 don                          33         11       2132
  5 rambo                        32         11       2121
  7 dimpu                        33         12       2314
  8 chir                         34         10       2123
  9 nag                          35         10       2213
 10 ram                          28         13       2141

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Use the modulo operator? The mod() form is the standard way, but a lot of db's use the % operator too.

select * from table where MOD(ID,3) = 1;

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SET @i = 0;
SELECT ..., ((@i := @i + 1) % 3) AS `i` FROM `table` ... HAVING `i` = 1

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select * from table where id in (1,4,7,10,13)

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SELECT * FROM table
WHERE ID % 3 = 1

Assuming, of course, that you are looking for every third ID.

Also, this is done with SQL Server - not sure what database you are using.

EDIT

Here is an option without using ID (SQL Server)

SELECT *
FROM (SELECT *, ROW_NUMBER() OVER(ORDER BY Name) RowNum
      FROM table) X
WHERE X.RowNum % 3 = 1