PHP-MySQL 查询“SELECT BETWEEN”

Question

"SELECT MAX(buildno) FROM ".$tbl." WHERE( day BETWEEN '$fd' and '$cd') and month='$cm'"

I am using the above query to select data between two days in a particular month , is this the correct way to incorporate PHP variables in SELECT BETWEEN query?

Answer 1

If you compare two integer values remove single quote for your query.

I never use max() function for performance, so the query is :

SELECT buildno FROM ".$tbl." WHERE ( day BETWEEN $fd and $cd ) AND month=$cm ORDER BY buildno DESC LIMIT 1

For best results when using BETWEEN with date or time values, use CAST() to explicitly convert the values to the desired data type. Examples: If you compare a DATETIME to two DATE values, convert the DATE values to DATETIME values. If you use a string constant such as '2001-1-1' in a comparison to a DATE, cast the string to a DATE.

Answer 2

您将变量名作为字符串发送，您需要连接（就像您对 $tbl 所做的那样：

"SELECT MAX(buildno) FROM ".$tbl." WHERE day BETWEEN '".$fd."' and '".$cd."' and month='".$cm."'"