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问题 I need some help with a SQL (in particular: SQLite) related problem. I have a table 'vacation' CREATE TABLE vacation( name TEXT, to_date TEXT, from_date TEXT ); where I store the date (YYYY-MM-DD), when somebody leaves for vacation and comes back again. Now, I would like to get a distinctive list of all dates, where somebody is on vacation. Let's assume my table looks like: +------------+-------------+------------+ | name | to_date | from_date | +------------+-------------+------------+ |

问题 I have the following query, SELECT * FROM LOGS WHERE CHECK_IN BETWEEN CONVERT(datetime,'2013-10-17') AND CONVERT(datetime,'2013-10-18') this query not returning any result, but the following query return the result, SELECT * FROM LOGS WHERE CHECK_IN >= CONVERT(datetime,'2013-10-17') why the first query not returning any result? If I did any mistake pls correct me. 回答1: Do you have times associated with your dates? BETWEEN is inclusive, but when you convert 2013-10-18 to a date it becomes 2013

问题 I have a SQL statement to display data between two dates. I almost got it but there's a problem. If I input March 1,2012 to March 7, 2012 .. it should show data with dates between the two.. but it also show all of the dates under March 2012.. but whenever I input March 10, 2012 to March 30, 2012 the SQL works perfectly.. any help will be appreciated. thanks SELECT agentname, noofcalls, qualified, booking, resched, actualbooking, sales, remarks, concat(month,' ',day,',',year) as 'date' FROM

问题 | id | first (datetime) | last (datetime) -------------------------------------------------------- | 1 | 2013-04-15 00:00:00 | 2013-04-21 23:59:00 | 2 | 2013-04-08 00:00:00 | 2013-04-14 23:59:00 | 3 | 2013-04-01 00:00:00 | 2013-04-07 23:59:00 | 4 | 2013-04-01 00:00:00 | 2013-04-07 23:59:00 I want to show records if records datetime range covers today. (3 and 4 for this sample) I tried do this with two NOW() , it gives syntax error in second NOW() . How can i do this? 回答1: select * from your

问题 I have a start and an end date in my database and a $date variable from a form field. I am now trying to query all the rows where $date is either = start/end date in the db, or ANY date between those two. It's kind of the opposite of what is described in the docs of how daysAsSql works. I can't figure out how to get it to work. The following line does not work as a find condition in the controller: '? BETWEEN ? AND ?' => array($date, 'Item.date_start', 'Item.date_end'), Any help is greatly

问题 I have the following tables and am trying to look up county codes for a list of several hundred thousand cities. create table counties ( zip_code_from char(5) not null, zip_code_thru char(5) not null, county_code char(3) not null ); create table cities ( city text not null, zip_code char(5) not null ); My first approach was using a "between" in the join: select ci.city, ci.zip_code, co.county_code from cities ci join counties co on co.zip_code between ci.zip_code_from and ci.zip_code_thru I

问题 I am storing my dates in column server_date_time in varchar in dd/mm/yyyy format and i want to fetch the records lying between some dates so i have used the query select * from activity_emp where date_format(str_to_date(substr(server_date_time,1,10),'%d/%m/%Y'),'%d/%m/%Y')>= '29/09/2012' and date_format(str_to_date(substr(server_date_time,1,10),'%d/%m/%Y'),'%d/%m/%Y')<= '07/10/2012'; I have converted varchar to string in query but my query return query data only related to 29/09/2012 and 30

问题 These two statements are logically equivalent: SELECT * FROM table WHERE someColumn BETWEEN 1 AND 100 SELECT * FROM table WHERE someColumn >= 1 AND someColumn <= 100 Is there a potential performance benefit to one versus the other? 回答1: No benefit, just a syntax sugar. By using the BETWEEN version, you can avoid function reevaluation in some cases. 回答2: There's no performance benefit, it's just easier to read/write the first one. 回答3: No, no performance benifit. Its just a little candy. If

问题 I am building a small Web App that lets users reserve Office Rooms and Equipment. For the Reservation they enter a Start and an End Date. When a user tries to find out if any (for example) car is available on 2012-10-23, and the database holds reservation date records of Start: 2012-10-20 and End: 2012-10-25 for (lets say) all the cars, how do I include all the dates between my date entries in the search? The $date variable gets it's value from the Date Search Form Field. This, unfortunately

问题 As seen below the two queries, we find that they both work well. Then I am confused why should we ever use BETWEEN because I have found that BETWEEN behaves differently in different databases as found in w3school SELECT * FROM employees WHERE salary BETWEEN 5000 AND 15000; SELECT * FROM employees WHERE salary >= 5000 AND salary <= 15000; 回答1: BETWEEN can help to avoid unnecessary reevaluation of the expression: SELECT AVG(RAND(20091225) BETWEEN 0.2 AND 0.4) FROM t_source; --- 0.1998 SELECT