subquery

问题 I want to implement a subquery using the query builder but I'm not understanding the syntax. I'm dealing with a locations table that has entries that can be cities, states or zip codes depending on the location type set. I want to get all locations that are in a certain state and take out any that are city type and have a population below a certain amount. $qb->select('l') ->from('Entity\Location', 'l') ->where('l.state = :state') ->setParameter('state', 'UT') ->andWhere('...don't know what

问题 My problem is that I want to retrieve both a list of measurements along with a moving average of those measurements. I can do that with this SQL statement (postgresql interval syntax): SELECT time, value, ( SELECT AVG(t2.value) FROM measurements t2 WHERE t2.time BETWEEN t1.time - interval '5 days' AND t1.time ) moving_average FROM measurements t1 ORDER BY t1.time; I want to have the SQLAlchemy code to produce a similar statement to this effect. I currently have this Python code: moving

问题 I have query like the following select columns from (select columns1 from result_set where condition_common and condition1) as subset1 join (select columns2 from result_set where condition_common and condition2) as subset2 on subset1.somekey = subset2.somekey I want to somehow reuse select columns from result_set where condition_common I have oversimplified the above query, but the above select in reality is huge and complicated. I dont want to have the burden of making sure both are in sync

问题 I have an model called Object (doesn't really matter what it is) It has a default price (column is called "price"). And then there is a Schedule object that allows to override the price for specific dates. I want to be able to determine the MINIMUM price (which is by definition the MINIMUM between the default and "current" price) during the SQL-query just in order to be able to ORDER BY the calculated minimum price I want to make my search query as efficient as possible and I was wondering if

问题 I'm attempting to collect details about backup activity from a ProgreSQL DB table on a backup appliance (Avamar). The table has several columns including: client_name, dataset, plugin_name, type, completed_ts, status_code, bytes_modified and more. Simplified example: | session_id | client_name | dataset | plugin_name | type | completed_ts | status_code | bytes_modified | |------------|-------------|---------|---------------------|------------------|----------------------|-------------|-------

问题 I'm attempting to collect details about backup activity from a ProgreSQL DB table on a backup appliance (Avamar). The table has several columns including: client_name, dataset, plugin_name, type, completed_ts, status_code, bytes_modified and more. Simplified example: | session_id | client_name | dataset | plugin_name | type | completed_ts | status_code | bytes_modified | |------------|-------------|---------|---------------------|------------------|----------------------|-------------|-------

问题 As the title says, I wanted a workaround for this... SELECT comments.comment_id, comments.content_id, comments.user_id, comments.`comment`, comments.comment_time, NULL FROM comments WHERE (comments.content_id IN (SELECT content.content_id FROM content WHERE content.user_id = 1 LIMIT 0, 10)) Cheers 回答1: SELECT comments.comment_id, comments.content_id, comments.user_id, comments.`comment`, comments.comment_time, NULL FROM ( SELECT content.content_id FROM content WHERE content.user_id = 1 LIMIT

问题 I'm sure this will be a very simple question for most of you, but it is driving me crazy... I have a table like this (simplifying): | customer_id | date | purchase amount | I need to extract, for each day, the number of customers that made a purchase that day, and the number of customers that made at least a purchase in the 30 days previous to the current one. I tried using a subquery like this: select purch_date as date, count (distinct customer_id) as DAU, count(distinct (select customer_id

问题 I have a forum where users can post questions and can comment and tweet. I want to get all the comments and tweets of each post. What i did previously was do that in 3 sets queries. $data = mysqli_query($con,"select * from posts"); while($row = mysqli_fetch_assoc($data)){ $pid = $row['post_id']; $dataCo = mysqli_query("SELECT comments.* FROM comments WHERE post_id = $pid"); $dataTw = mysqli_query("SELECT tweets.* FROM tweets WHERE post_id = $pid"); //2 while loop for comments and tweets } Can

问题 My query has too many subqueries and each query has repeated parameters. How to design the report in eclipse. This is my query SELECT C.COMP_CODE,C.MATCODE,C.ATTRIB1,C.ATTRIB2,C.MAT_NAME,C.SUP_PROD_CODE, C.SUP_CODE,C.BRAND_CODE,C.CAT_CODE,SGRPCODE,SUB_SGRPCODE,C.UNIT_CODE, NVL(SUM(D.SALES_QTY),0)SALES_QTY, NVL(SUM(D.SALES_VAL),0) SALES_VAL, MAX(COST_PRICE) GRN_COST_PRICE,GRN_DATE,'sales qty' a, 'sales val' b,'stock' c,'stock val' d FROM ( SELECT A.COMP_CODE,A.MATCODE,B.UNIT_CODE,A.ATTRIB1,A