subquery

问题 Im sure this is a simple technique although I can't find an answer so far! I have TIMESTAMP | POINTNAME | VALUE 2012-10-10 16:00:00 AHU01 20 2012-10-10 16:00:00 AHU02 25 2012-10-10 16:00:15 AHU01 26 2012-10-10 16:00:15 AHU02 35 etc... ( for approx 800 POINTNAMES) with many pointnames I dont want to list each one in the 'IN' clause of the pivot 'FOR' (as syntax given below) definition but would like to use perhaps a subquery. So what I would like is all the POINTNAME values as columns with A

问题 Im sure this is a simple technique although I can't find an answer so far! I have TIMESTAMP | POINTNAME | VALUE 2012-10-10 16:00:00 AHU01 20 2012-10-10 16:00:00 AHU02 25 2012-10-10 16:00:15 AHU01 26 2012-10-10 16:00:15 AHU02 35 etc... ( for approx 800 POINTNAMES) with many pointnames I dont want to list each one in the 'IN' clause of the pivot 'FOR' (as syntax given below) definition but would like to use perhaps a subquery. So what I would like is all the POINTNAME values as columns with A

问题 I was given this SQL query by my boss and told to improve/optimize it DECLARE @pol_0 int, @pol_1 int, @pol_2 int, @pol_3 int, @pol_4 int, @pol_5plus int, @peril_0 int, @peril_1 int, @peril_2 int, @peril_3 int, @peril_4 int, @peril_5plus int, @loc_1 int, @loc_2_10 int, @loc_11_100 int, @loc_101_1000 int, @loc_1001_5000 int, @loc_5001plus int, @locfass int, @polfass int, @pollim int, @polattpt int, @polded int, @maxded int, @polres int, @sublimit int, @sitelim int, @siteded int, @SS int, @WX

问题 I asked this question few days ago on SO, but with no valid answer for it. The problem was that the following query: SELECT t1.patient_id, CONVERT(aes_decrypt(t4.patient_name_en, :encKey) USING utf8mb4) as patient_name_en, min(t3.date_of_visit) as date_of_visit, t2.diagnosis_name, max(ifnull(t5.date_of_assessment, 'N/A')) as date_of_assessment, ifnull(t5.assessment_result, 0) as assessment_result FROM consultation t1 LEFT JOIN diagnosis t2 ON t1.diagnosis_id = t2.diagnosis_id LEFT JOIN visit

问题 Given below is a sample of my two different query execution with same result The select query using inner-select . select p.product from ( select * from tbl_a where productid not in (select productid from tbl_b) ) p order by p.product And select query using CTE . with cte as ( select * from tbl_a where productid not in (select productid from tbl_b) ) select product from cte order by product So my question is which among the above is good to use? And At what condition can use each of them? 回答1

问题 I have two queries on the same table which have identical where clause. This: SELECT qa.id, qa.subject, qa.category cat, qa.keywords tags, qa.body_html, qa.amount, qa.visibility, qa.date_time, COALESCE(u.reputation, 'N') reputation, COALESCE(Concat(u.user_fname, ' ', u.user_lname), 'unknown') NAME, COALESCE(u.avatar, 'anonymous.png') avatar, ( SELECT COALESCE(Sum(vv.value),0) FROM votes vv WHERE qa.id = vv.post_id AND 15 = vv.table_code) AS total_votes, ( SELECT COALESCE(Sum(vt.total_viewed)

问题 Problem: I have a list of names and addresses. Some names (persons) have the same address (street, zip code, town) like others. I want to select all those names with addresses with no more than three occurrences and from the rest the first three names each of a bunch pointing to the same address. Example: Albert | Adr1 Berta | Adr1 Cesar | Adr1 Donald | Adr1 Eric | Adr2 Fritz | Adr2 Gerd | Adr2 Henry | Adr3 The result set should be Albert | Adr1 Berta | Adr1 Cesar | Adr1 Eric | Adr2 Fritz |

问题 Problem: I have a list of names and addresses. Some names (persons) have the same address (street, zip code, town) like others. I want to select all those names with addresses with no more than three occurrences and from the rest the first three names each of a bunch pointing to the same address. Example: Albert | Adr1 Berta | Adr1 Cesar | Adr1 Donald | Adr1 Eric | Adr2 Fritz | Adr2 Gerd | Adr2 Henry | Adr3 The result set should be Albert | Adr1 Berta | Adr1 Cesar | Adr1 Eric | Adr2 Fritz |

问题 This problem occurs in both NHibernate 2 and 3. I have a Class A that has a member set of class B. Querying the classes directly executes nicely. But when I pass one of the expressions involving class B into a method I get the following error: System.ArgumentException: Object of type 'System.Linq.Expressions.ConstantExpression' cannot be converted to type 'System.Linq.Expressions.LambdaExpression'. As far as I can see I am passing the exact same expression into the Any() method. But for some

问题 I am trying to identify value from one column which does exist in another column in same table Sub query SELECT DISTINCT `Wear it With - Outfits 1` FROM `product list` WHERE `Wear it With - Outfits 1` NOT IN (SELECT `sku` FROM `product list`) ...returns result in 2.7287sec I tried to replace sub query by left join SELECT DISTINCT table1.`Wear it With - Outfits 1` FROM `product list` as table1 LEFT JOIN `product list` as table2 ON table1.`Wear it With - Outfits 1`=table2.sku WHERE table2.sku