clause

Not sure how I can do this. Basically I have variables that are populated with a combobox and then passed on to form the filters for a MQSQL query via the where clause. What I need to do is allow the combo box to be left empty by the user and then have that variable ignored in the where clause. Is this possible? i.e., from this code. Assume that the combobox that populates $value1 is left empty, is there any way to have this ignored and only the 2nd filter applied. $query = "SELECT * FROM moth_sightings WHERE user_id = '$username' AND location = '$value1' AND english_name = $value2 "; $result

I can't get WHERE IN clause to work on android SQLite database. Is there any way to execute a statement like this in android? : SELECT body FROM table1 WHERE title IN ('title1', 'title2', 'title3') You can use TextUtils.join(",", parameters) to take advantage of sqlite binding parameters, where parameters is a list with "?" placeholders and the result string is something like "?,?,..,?" . Here is a little example: Set<Integer> positionsSet = membersListCursorAdapter.getCurrentCheckedPosition(); List<String> ids = new ArrayList<>(); List<String> parameters = new ArrayList<>(); for (Integer

mysql 5.7之后，对group by的处理有所区别，这里基于一个demo做一些探究 官方文档： https://dev.mysql.com/doc/refman/5.7/en/group-by-handling.html https://dev.mysql.com/doc/refman/5.7/en/sql-mode.html#sqlmode_only_full_group_by 需求 统计用户登录次数，显示用户Id和姓名，如下： 基于上面的需求，假设目前只有一张'用户登录日志表'可用： DROP TABLE IF EXISTS user_login; CREATE TABLE `user_login` ( `id` INT (11) NOT NULL AUTO_INCREMENT COMMENT '自增主键', `user_id` INT (11) DEFAULT NULL COMMENT '用户Id', `user_name` VARCHAR (100) DEFAULT NULL COMMENT '用户姓名（冗余：可变性不大，业务要求不严）', `login_time` datetime DEFAULT NULL COMMENT '登录时间', PRIMARY KEY (`id`) ) ENGINE = INNODB AUTO_INCREMENT = 1 DEFAULT

I have a clause like following: lock_open:- conditional_combination(X), equal(X,[8,6,5,3,6,9]),!, print(X). this clause succeed. But I want to know how many times conditional_combination() is called before equal(X,[8,6,5,3,6,9]) is become true. the program is to generate a permutation by following some rules. And I need to how many permutation is need to generate to get a particular value like 865369. What you actually want is something slightly different: You want to count the number of answers (so far) of a goal. The following predicate call_nth(Goal_0, Nth) succeeds like call(Goal_0) but

I am writing a stored procedure where I have an input parameter called my_size that is an INTEGER . I want to be able to use it in a LIMIT clause in a SELECT statement. Apparently this is not supported, is there a way to work around this? # I want something like: SELECT * FROM some_table LIMIT my_size; # Instead of hardcoding a permanent limit: SELECT * FROM some_table LIMIT 100; TheSoftwareJedi A search turned up this article . I've pasted the relevant text below. Here's a forum post showing an example of prepared statements letting you assign a variable value to the limit clause: http:/