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This question already has an answer here: How ROWNUM works in pagination query? 3 answers When I am using rownum and between keywords then the query doesn't return any rows. Can anyone explain the reason why query is not retrieving any rows? select * from cus where rownum between 2 and 6; I just want to check whether rownum will work when it is used with between keyword .So ,I just tried the above query to display the rows which are in between 2 and 6. But when I tried to execute the query, it doesn't retrieve any rows. thanks in advance Oracle rownum starts at 1, so you will never get the

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 30/09/2012. It should also return query for the month of October Try with this. You can input date in dd/mm

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? No benefit, just a syntax sugar. By using the BETWEEN version, you can avoid function reevaluation in some cases. There's no performance benefit, it's just easier to read/write the first one. No, no performance benifit. Its just a little candy. If you were to check a query comparison, something like DECLARE @Table TABLE( ID INT ) SELECT * FROM @Table WHERE ID >= 1

The project that I'm working on is using MySQL on RDS (mysql2 gem specifically). When I use a hash of conditions including a range in a where statement I'm getting a bit of an odd addition to my query. User.where(id: [1..5]) and User.where(id: [1...5]) Result in the following queries respectively: SELECT `users`.* FROM `users` WHERE ((`users`.`id` BETWEEN 1 AND 5 OR 1=0)) SELECT `users`.* FROM `users` WHERE ((`users`.`id` >= 1 AND `users`.`id` < 5 OR 1=0)) The queries work perfectly fine since OR FALSE is effectively a no-op. I'm just wondering why Rails or ARel is adding this snippet into the

BETWEEN is used in a WHERE clause to select a range of data between two values. If I am correct whether the range's endpoint are excluded or not is DBMS specific. What I can not understand in the following: If I have a table of values and I do the following query: SELECT food_name FROM health_foods WHERE calories BETWEEN 33 AND 135;` The query returns as results rows including calories =33 and calories =135 (i.e. range endpoints are included ). But if I do: SELECT food_name FROM health_foods WHERE food_name BETWEEN 'G' AND 'O'; I do not get rows with food_name starting with O . I.e. the end of

I'm using PostgreSQL (9.2.0) and have a table of IP ranges. Here's the SQL: CREATE TABLE ips ( id serial NOT NULL, begin_ip_num bigint, end_ip_num bigint, country_name character varying(255), CONSTRAINT ips_pkey PRIMARY KEY (id ) ) I've added indices on both begin_ip_num and end_ip_num : CREATE INDEX index_ips_on_begin_ip_num ON ips USING btree (begin_ip_num ); CREATE INDEX index_ips_on_end_ip_num ON ips USING btree (end_ip_num ); The Query being used is: SELECT "ips".* FROM "ips" WHERE (3065106743 BETWEEN begin_ip_num AND end_ip_num); The problem is that my BETWEEN query is only using the

I need help in optimize a PostgreSQL query which uses the BETWEEN clause with a timestamp field. I have 2 tables: ONE(int id_one(PK), datetime cut_time, int f1 . . .) containing about 3394 rows TWO(int id_two(PK), int id_one(FK), int f2 . . .) containing about 4000000 rows There are btree indexes on both PKs id_one and id_two , on the FK id_one and cut_time . I want to perform a query like: select o.id_one, Date(o.cut_time), o.f1, t.f2 from one o inner join two t ON (o.id_one = t.id_one) where o.cut_time between '2013-01-01' and '2013-01-31'; This query retrieves about 1.700.000 rows in about

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; 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 AVG(RAND(20091225) >= 0.2 AND RAND(20091225) <= 0.4) FROM t_source; --- 0.3199 t_source is just a dummy table