select

问题 Imagine the following code: import threading, zmq, time context = zmq.Context() receivers = [] poller = zmq.Poller() def thread_fn(number: int): sender = context.socket(zmq.PUSH) sender.connect("tcp://localhost:%d" % (6666 + number)) for i in range(10): sender.send_string("message from thread %d" % number) for i in range(3): new_receiver = context.socket(zmq.PULL) new_receiver.bind("tcp://*:%d" % (6666 + i)) poller.register(new_receiver, zmq.POLLIN) receivers.append(new_receiver) threading

问题 I want to make query like this one: SELECT lyrics FROM cache WHERE author=%s0, title=%s1 LIMIT 1; where strings %s0 and %s1 should be substituted. Assuming strings are not sanitized, UTF-8 encoded (As database itself), simple null-terminated char* arrays. What are my options to do this? Are there any built-in functions in SQLite (C API) for this? 回答1: Like mentioned in comments already prepared statements should be used. Why Prepared Statements Should Be Favoured When you create SQL queries

问题 The data I am working on looks like below- A_ID B_ID count 123 abcd 1000 123 aaaa 2000 123 aaaa 3000 456 null 50 456 bbbb 6000 456 cccc 450 I want to be able to extract the B_id that has the highest count for a given A_id The result should look like- A_ID B_ID count 123 aaaa 3000 456 bbbb 6000 How to achieve this result? 回答1: One option is to filter with a subquery: select t.* from mytable t where t.count = (select max(t1.count) from mytable t1 where t1.a_id = t.a_id) You can also use window

问题 The context here is a SQLCipher database in an Android app. The context here is a SQLCipher database in an Android app. The context here is a SQLCipher database in an Android app. Consider the following SQLite table CREATE TABLE IF NOT EXISTS test(a INTEGER NOT NULL,b INTEGER NOT NULL,c INTEGER NOT NULL,d INTEGER NOT NULL); into which I insert the following rows INSERT INTO test (a,b,c,d) VALUES(1,2,3,4); INSERT INTO test (a,b,c,d) VALUES(1,2,3,5); INSERT INTO test (a,b,c,d) VALUES(1,2,5,5);

问题 I have the following Source table where in there are records with start and end timestamps of a person logging in and logging out. employeeNumber | start_time | end_time john | 10/02/2020 16.30.000 | 11/02/2020 02.00.000 john | 10/02/2020 20.00.000 | 10/02/2020 22.00.000 john | 10/02/2020 23.00.000 | 11/02/2020 01.00.000 rick | 10/02/2020 10.00.000 | 10/02/2020 11.00.000 rick | 10/02/2020 13.00.000 | 10/02/2020 14.30.000 tom | 10/02/2020 09:00.000 | 10/02/2020 18.00.000 As you can see john

问题 I write this Html and use Bootstrap-select to create jquery select <select id="type" class="selectpicker"> <option>Select...</option> <option value="1">1</option> <option value="2">2</option> how can I check mouseover or hover event with jquery ? I want to alert the value of options. Bootstrap-select creates select box SelectBox is constructed in the following manner: <ul class="dropdown-menu inner "><li class="selected active"><a role="option" aria-disabled="false" tabindex="0" class=

问题 Suppose I have the following simple table: create table mytable ( desid bigint not null, ancid bigint not null ); insert into mytable (ancid,desid) values (1,10); insert into mytable (ancid,desid) values (1,20); insert into mytable (ancid,desid) values (1,21); insert into mytable (ancid,desid) values (1,22); insert into mytable (ancid,desid) values (2,30); insert into mytable (ancid,desid) values (3,40); insert into mytable (ancid,desid) values (3,41); insert into mytable (ancid,desid) values

问题 I am trying to obtain the odds of the link and I get an error. DO you know what I am doing wrong? Thank you import requests from bs4 import BeautifulSoup as bs url = 'https://www.oddsportal.com/soccer/spain/laliga' r = requests.get(url, headers = {'User-Agent' : 'Mozilla/5.0'}) soup = bs(r.content, 'lxml') ##print([a.text for a in soup.select('#tournamentTable tr[xeid] [href*=soccer]')]) print([b.text for b in soup.select('#tournamentTable td[xodd]')]) I am expecting to obtain 10 rows and 3

问题 Can you please help to mark duplicated values in an additional column without grouping duplicated values? See my example data (Example what I have and What I need to achieve on the right): As you can see I have Product ID with suffix E (Power) and G (Gas). Some Product IDs are duplicated: the same Product ID - one with E and the second one with G makes Dual Product . Product ID only with E makes Power_Only_product , Product ID only with G makes Gas_Only_product , the same Product ID with E

问题 I created a procedure that has two selects, I want to join the result of these two selects in one. This is my procedure CREATE PROCEDURE spConsultarVendas @nomeUsuario nvarchar(60), @dataEmissao datetime, @dataSaida datetime AS BEGIN SELECT NF.ID, NF.NaturezaOperacao, NF.DataEmissao, NF.ValorTotal FROM NotaFiscal AS NF INNER JOIN Venda AS V ON NF.ID_Venda = V.ID INNER JOIN Usuario AS U ON V.ID_UsuarioComissao1 = U.ID WHERE U.Descricao = @nomeUsuario AND (NF.DataEmissao >= @dataEmissao AND NF