mysql 循环创建列_MySQL在select语句中生成带有循环的列

In MySQL I have a function that takes a number argument and spits out a subset of results from another table, based on that number. Implementation currently looks like:

SELECT

id,

date,

function(do stuff with value 1) as t1,

function(do stuff with value 2) as t2,

function(do stuff with value 3) as t3,

...

function(do stuff with value N) as tN

FROM table

Can you use a loop in a select statement (or even a procedure that builds a table) so the above becomes:

SELECT

id,

date,

LOOP x = 1 through N

function(do stuff with value x) as tx,

END LOOP

FROM table

Thanks.

解决方案

yes you can... take a look into DynamicSQL..

In general, you build a string that contains the SQL statement you want to execute, then prepare it, then execute it...