in-operator

Alternative to in operator in mysql

由 拜拜、爱过 提交于 2019-12-11 08:54:52
问题 I see In operator alternative in mysql I have nearly 25,000 ids.I am using in operator on that.Then i am getting Stackoverflow Exception .Is there any other alternative for IN operator in mysql. Thanks in advance.. 回答1: If the ID's are in another table: SELECT * FROM table1 WHERE id IN (SELECT id FROM table2); then you can use a join instead: SELECT table1.* FROM table1 INNER JOIN table2 ON table1.id = table2.id; 回答2: You could do the following: 1 - Create a MySQL Temporary Table CREATE

Mysql select Query with multiple conditions of same column

由 假如想象 提交于 2019-12-11 07:11:40
问题 I need MySQL select query like select wt_id,wt_name from work_type where cat_id=1,2,5..; Is it possible? 回答1: You just have to use IN operator SELECT wt_id, wt_name FROM work_type WHERE cat_id IN (1,2,5..); 回答2: Use IN operator ex. ... where cat_id IN (1,2,5..) 回答3: You can use SQL IN operator. SELECT wt_id, wt_name FROM work_type WHERE cat_id IN (1,2,5..); If you have any question please comment below. 来源： https://stackoverflow.com/questions/27620069/mysql-select-query-with-multiple

SQL Server: IN ('asd') not working when column is NTEXT

由 末鹿安然 提交于 2019-12-10 11:03:51
问题 How can I fix this problem? where someNtext IN ('asd',asd1') gives an error: Msg 402, Level 16, State 1, Line XXXXX The data types ntext and varchar are incompatible in the equal to operator. 回答1: An IN list is just short-hand for OR conditions. The LIKE clause works with NTEXT and TEXT fields. So, you can combine those two ideas to do this: WHERE ( someNtext LIKE N'asd' OR someNtext LIKE N'asd1' ) However, as @marc_s suggested in a comment on the Question, NVARCHAR(MAX) is preferred as all

Postgresql IN operator Performance: List vs Subquery

由 爷，独闯天下 提交于 2019-12-08 21:38:31
问题 For a list of ~700 ids the query performance is over 20x slower than passing a subquery that returns those 700 ids. It should be the opposite. e.g. (first query takes under 400ms, the later 9600 ms) select date_trunc('month', day) as month, sum(total) from table_x where y_id in (select id from table_y where prop = 'xyz') and day between '2015-11-05' and '2016-11-04' group by month is 20x faster on my machine than passing the array directly: select date_trunc('month', day) as month, sum(total)

Is python's “in” language construct thread-safe for lists?

由 半腔热情 提交于 2019-12-08 16:58:51
问题 Is obj in a_list thread-safe while a_list might be modified in a different thread? Here's a comprehensive yet non-exhaustive list of examples of list operations and whether or not they are thread safe, however I couldn't find any reference for the in language construct. In terms of python implementation, I use CPython, but answers re other implementations would be helpful too for the community. 回答1: I am assuming you are using CPython here. Provided there is no custom __contains__ or __iter__

SQL Server: IN ('asd') not working when column is NTEXT

由 試著忘記壹切 提交于 2019-12-06 10:55:37
How can I fix this problem? where someNtext IN ('asd',asd1') gives an error: Msg 402, Level 16, State 1, Line XXXXX The data types ntext and varchar are incompatible in the equal to operator. An IN list is just short-hand for OR conditions. The LIKE clause works with NTEXT and TEXT fields. So, you can combine those two ideas to do this: WHERE ( someNtext LIKE N'asd' OR someNtext LIKE N'asd1' ) However, as @marc_s suggested in a comment on the Question, NVARCHAR(MAX) is preferred as all string functions work with it (and the TEXT , NTEXT , and IMAGE datatypes have been deprecated as of SQL

Imitating the “IN” Operator

由 馋奶兔 提交于 2019-12-05 09:14:04
问题 How can one achieve: if X in (1,2,3) then instead of: if x=1 or x=2 or x=3 then In other words, how can one best imitate the IN operator in VBA for excel? 回答1: I don't think there is a very elegant solution. However, you could try: If Not IsError(Application.Match(x, Array("Me", "You", "Dog", "Boo"), False)) Then or you could write your own function: Function ISIN(x, StringSetElementsAsArray) ISIN = InStr(1, Join(StringSetElementsAsArray, Chr(0)), _ x, vbTextCompare) > 0 End Function Sub

Python “in” operator speed

由 房东的猫 提交于 2019-12-01 16:41:41
Is the in operator's speed in python proportional to the length of the iterable? So, len(x) #10 if(a in x): #lets say this takes time A pass len(y) #10000 if(a in y): #lets say this takes time B pass Is A > B? A summary for in: list - Average: O(n) set/dict - Average: O(1), Worst: O(n) See this for more details. There's no general answer to this: it depends on the types of a and especially of b . If, for example, b is a list, then yes, in takes worst-case time O(len(b)) . But if, for example, b is a dict or a set, then in takes expected-case time O(1) (i.e., constant time). About "Is A > B?",

PDO prepared statements IN clause with named placeholders doesn't work as expected

由 爷，独闯天下 提交于 2019-12-01 09:49:47
Let's say in a scenario: $ids = 2,3 . But for some reason the records are getting returned as if: $ids = 2 . I believe there's some problem in this line from the complete code, because when I echo $ids , it returns 2,3 , but the actual query returns as if there's only one id. I.e. it returns events from one course only (of id 2). $statement->execute(array("ids" => $ids, 'timestart' => $timestart, 'timeend' => $timeend))) { my full code: $ids = array_map(function($item) { return $item->id; }, $entitlementsVOs); $ids = implode(', ', $ids); //echo shows 2,3 $timestart = isset($_GET['start']) && $

PDO prepared statements IN clause with named placeholders doesn't work as expected

由 与世无争的帅哥 提交于 2019-12-01 08:24:01
问题 Let's say in a scenario: $ids = 2,3 . But for some reason the records are getting returned as if: $ids = 2 . I believe there's some problem in this line from the complete code, because when I echo $ids , it returns 2,3 , but the actual query returns as if there's only one id. I.e. it returns events from one course only (of id 2). $statement->execute(array("ids" => $ids, 'timestart' => $timestart, 'timeend' => $timeend))) { my full code: $ids = array_map(function($item) { return $item->id; },
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