[英]MySQL query from PHP
I need to make this query from PHP: 我需要从PHP进行以下查询:
set @row:=-1;
SELECT * FROM `tablename`
INNER JOIN (
SELECT `id` FROM (
SELECT @row:=@row+1 AS rownum, `id` FROM (
SELECT id FROM `tablename` ORDER BY `id` DESC
)
AS sorted
) as ranked WHERE rownum % 14 = 0
) AS subset ON subset.id = `tablename`.id LIMIT 24;
Works fine in PHPMyAdmin, but I have an error for the "set@row=-1;". 在PHPMyAdmin中工作正常,但是“ set @ row = -1;”出现错误。 :(
:(
Thanks in advance! 提前致谢!
You might be trying to use these statements in a single mysqli_query
statement. 您可能试图在单个
mysqli_query
语句中使用这些语句。 These are multiple statements; 这些是多个语句; you need to query them separately, while using PHP code.
您需要在使用PHP代码时分别查询它们。
However, you can also convert these two queries into a single query using CROSS JOIN
: 但是,您也可以使用
CROSS JOIN
将这两个查询转换为单个查询:
SELECT * FROM `tablename`
INNER JOIN (
SELECT `id` FROM (
SELECT @row:=@row+1 AS rownum, `id` FROM (
SELECT id FROM `tablename` ORDER BY `id` DESC
) AS sorted
CROSS JOIN (SELECT @row := -1) AS user_init_vars
/* shifted SET statement to the above line (remove the comment before using) */
) as ranked WHERE rownum % 14 = 0
) AS subset ON subset.id = `tablename`.id LIMIT 24;
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.