nested-query | 易学教程

How to avoid nested SQL query in this case?

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问题 I have an SQL question, related to this and this question (but different). Basically I want to know how I can avoid a nested query. Let's say I have a huge table of jobs ( jobs ) executed by a company in their history. These jobs are characterized by year, month, location and the code belonging to the tool used for the job. Additionally I have a table of tools ( tools ), translating tool codes to tool descriptions and further data about the tool. Now they want a website where they can select

Can SELECT, SELECT COUNT and cross reference tables be handled by just one query?

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问题 I have a page that displays a list of projects. With each project is displayed the following data retrieved from a mysqli database: Title Subtitle Description Part number (1 of x) The total number of photos associated with that project A randomly selected photo from the project A list of tags Projects are displayed 6 per page using a pagination system As this is based on an old project of mine, it was originally done with sloppy code (I was just learning and did not know any better) using

parse.com - Nested query and Join Table

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问题 I have problem with nested query. In query5.whereEqualTo("piwo", followList2.get(0)) I want to get the object, but it spits error that followList2 needs to be declared final, but when it does all the anonymous class gets in red with Cannot resolve constructor(...) error. Anyone got this before? ParseQuery<ParseObject> query3 = ParseQuery.getQuery("Piwo"); query3.whereEqualTo("marka", beer); // TODO if(beer == "all") then don't use it query3.findInBackground(new FindCallback<ParseObject>() {

In SQL Server, how do I retrieve data values from table column names identified in a sub-query?

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问题 I am using the following SQL to list all table and column names in my schema for tables containing columns whose names contain the string "code" using the following SQL server query: SELECT a.table_name, a.column_name from (SELECT t.name AS table_name, SCHEMA_NAME(schema_id) AS schema_name, c.name AS column_name FROM sys.tables AS t INNER JOIN sys.columns c ON t.OBJECT_ID = c.OBJECT_ID WHERE c.name LIKE '%code%') a Result: Table Name Column Name ---------- ----------- Tab_1_name a_code Tab_2

Query a nested array in MongoDb

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问题 I would like to retrieve documents by the presence of an string in a nested array. For example, the data (representing a dependency parse of a sentence) looks like: {'tuples': [['xcomp', 'multiply', 'using'], ['det', 'method', 'the'], ['nn', 'method', 'foil'], ['dobj', 'using', 'method']]} The closest solution I've found assumes that ['nn', ...] is the second position of the tuples list-of-lists: db.c.find({'tuples.2.0' : 'nn'}) Is there a way to relax the fixed position? The tuples (not

Is there a way to remove the nested query in this type of SQL SELECT?

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问题 Given this table structure and example data (t3 should not be used in the query, it is only here to show the relation between t1 and t2): t1 t2 t3 -------------- ----------------- -------------------------------- | id | value | | t1key | t3key | | id | value | | 1 | 2008 | | 3 | 1 | | 1 | "New intel cpu in 2010" | | 2 | 2009 | | 4 | 1 | | 2 | "New amd cpu in 2008" | | 3 | 2010 | | 6 | 1 | | | ... | | 4 | intel | | 1 | 2 | -------------------------------- | 5 | amd | | 5 | 2 | | 6 | cpu | | 6

How to get a nested sub-query to recognize parent query column

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问题 I have a problem where I'm trying to calculate a sum of values per given id. I decided to do this using sub-queries (typically I'd use a join, but I'm also keeping a counter for each sub-query for clipping purposes - see this question for more info). For the sake of this question, assume I have the following MySQL query: /* 1. */ SELECT /* 2. */ t1.experiement_id, /* 3. */ (SELECT sum(x.size) /* 4. */ FROM (SELECT size, ( @rownum := @rownum + 1 ) AS `rownum` /* 5. */ FROM data AS t0 /* 6. */

PHP SQL Query inside another Query's fetch() statement

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问题 This didn't return any helpful google results, so I'll just ask it here: Is it possible in PHP to start another query inside another query's fetch statement after executing() the first query? e.g. if ($stmt=mysqli->prepare(query)) { $stmt->bind_param('s', $variable); $stmt->execute(); $stmt->store_result(); while ($stmt->fetch()) { if ($stmt2=mysqli->prepare(query2)) { $stmt2->bind_param('s', $othervariable); $stmt2->execute(); $stmt2->store_result(); while ($stmt2->fetch()) { store result or

Is there a way to remove the nested query in this type of SQL SELECT?

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Given this table structure and example data (t3 should not be used in the query, it is only here to show the relation between t1 and t2): t1 t2 t3 -------------- ----------------- -------------------------------- | id | value | | t1key | t3key | | id | value | | 1 | 2008 | | 3 | 1 | | 1 | "New intel cpu in 2010" | | 2 | 2009 | | 4 | 1 | | 2 | "New amd cpu in 2008" | | 3 | 2010 | | 6 | 1 | | | ... | | 4 | intel | | 1 | 2 | -------------------------------- | 5 | amd | | 5 | 2 | | 6 | cpu | | 6 | 2 | | | ... | | | ... | -------------- ----------------- How would you build a SQL query that would

CAML query with nested ANDs and ORs for multiple fields

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I am working on proof-of-concept code to dynamically generate CAML based on keywords provided to a highly-specific search web service that I am writing. I am not using the SharePoint-provided search web service for this proof. I have done so already for what I am trying to achieve. From all of my research, I cannot find a close example for what I am trying to achieve, which is to check multiple fields for multiple values. Yes, I have looked on SO already for my answer, including this one: Need help on building CAML Query . With that said, if it is possible, how can the following SQL-like query