nested subquery

. Net extracts multi-layer nested JSON and. net multi-layer nested json Newtonsoft. Json. netbench DLL download please visit http://files.cnblogs.com/hualei/Newtonsoft.Json.Net20.rar Extract such json from. net 2.0 {"Name": "lily", "age": 23, "addr": {"city": guangzhou, "province": guangdong }} Reference namespace Using Newtonsoft. Json;Using Newtonsoft. Json. Linq; You can regard the preceding JSON as an o

Given a nested list of integers, return the sum of all integers in the list weighted by their depth.Each element was either an integer, or a list--whose elements may also be integers or other lists.Different from the previous question where weight are increasing from root to leaf, now the weight are defined from bottom u P. i.e., the leaf level integers has weight 1, and the root level integers has the largest weight.Example 1:Given the list [[1,1],2,

Laravel nested eager loading and laravel nested desire Today, I encountered A small problem when I used demand table A to query site type table B and then used the site type id in Table B to query the site type name in Table C. Fields in requirement Table A: id, user_id, name, and so on; Fields in the intermediate Table B: id, appeal_id, and field_type_id; Fields in site type Table C: id and display_name; I

There are two kinds: one is the second line style, English is called Next-lineOne is the style of the end of the line, English called End-of-lineExample Line end style Public classhelloworld{ Public Static voidMain (string[] args) {System. out. println ("helloworld!"); System. out. println ("helloworld!"); System. out. println ("helloworld!"); System. out. println ("(10.5+2*3)/(45-3.5)"); System. out. println (10.5+2*3)/( $-3.5)); }}Example of a second line style Public classhelloworld{ Public S

MySQL database BASICS (4) (subquery and link) (in continuous update), mysql is being updated 1. subquery Introduction The so-called "outer Query" does not refer to "Search", but is the collective name of all SQL statements. The Structured Query Language (Structured Query Language) is short for SQL. : 2. subqueries caused by comparison Operators Note: When a

1. PhenomenaCREATE Table A as (select 1 as col_a), create table B as (select 2 as Col_b) SELECT * from a Where col_a in (select Col_a fro M b)Where Col_a exists only in table_a, Table_b does not have the field, and the result of the entire statement can be executed successfully!2. Reason:The problem is confusing, and the reason for this is that "automatically looks for the outer layer when the column name in the subquery does not exist."In other words

Where subquery failed. This post was last edited by u010572351 from 2013-06-2817: 14: 25 nbsp; select nbsp; goods_id, cat_id, nbsp; goods_name nbsp; from nbsp; goods nbsp; where where subquery aborted, This post was last edited by u010572351 at 17:14:25 Select goods_id, cat_id, goods_name from goods where goods_id = (Select max (goods_id) from goods ); The statement is correct! However: Query the

Where subquery failed. This post was last edited by u010572351 from 2013-06-2817: 14: 25 nbsp; select nbsp; goods_id, cat_id, nbsp; goods_name nbsp; from nbsp; goods nbsp; where nbsp; goods_id nbsp; (select where subquery failed, This post was last edited by u010572351 at 17:14:25 Select goods_id, cat_id, goods_name from goods where goods_id = (Select max (goods_id) from goods ); The statement i

where stu_id in (select stu_id from GRADE where stu_score>85); Find student information that is greater than 85 points 2. Combined with existsThe exists and not EXISTS operators only test whether a subquery returns rows of data. If yes, exists will be true,not exists will be false. SELECT * from STUDENT where EXISTS (select stu_id from GRADE where stu_score>=100); If you have a student score greater than 100, ju

First, group queryUse the group BY keyword to group data, use the HAVING keyword to set constraints on grouped data, and complete data grouping and statistics1.1 Aggregation functions: Often used to achieve data statistics functions①count () Statistics record number of records②sum () sum③min () to find the minimum value④max () to find the maximum value⑤avg () averagingExample: Query the average worker number for all employeesNote: The SELECT statement queries only one value, so you cannot use li

Python nested dictionary comparison value and value implementation example, python nested dictionary example Preface This article provides examples to show you how to compare the values and values of the python nested dictionary and share the values for your reference and learning. I will not talk about them much here. Let's take a look at the detailed introducti

Data nested loops in thinkphp and thinkphp nested loops During thinkphp, nested loops are used in the loop, and the second loop is associated with the outside. The thinkphp official website provides the following documents: The tables I want to use here are: classification table (table 1) and data table (table 2) The effect to be achieved is: In fact, the princ

PHP nested output buffer code instance and php nested code instance PHP output cache can be nested. You can use ob_get_level () to output the nested level.The test results are different in cli and browser (PHP5.4 ). The manual description is as follows: Ob_get_level () will always return 0 inside a destructor.This hap

To implement the POI export Excel shape as--A1 (LV1)----B1 (LV2)----B2 (LV2)------C1 (LV3)------C2 (LV3)----B3 (LV2)--A1 (LV1)I. Data fields that can be usedID (primary key), PID (parent account ID), name (name), level (current hierarchy)Two. Ideas:Define an empty list of accounts to hold an already sequenced account. Create an iterator to the parent node to isolate all of its child nodes, traverse the child nodes into the list of accounts, and call the iterator again, so that the program can in

Nested classes in the class, then nested arrays and classes, all confused. Finally, this post was edited by jerryleeee from 2013-10-2503: 26: 59 class nbsp; editor {var nbsp; $ Error nbsp; var nbsp; $ Pages; function nbsp; vol () {$ Pages Nested classes in the class, and then nested arrays and classes, confused,

Nested classes in the class, then nested arrays and classes, all confused. Finally, this post was edited by jerryleeee from 2013-10-2503: 26: 59 class nbsp; editor {var nbsp; $ Error nbsp; var nbsp; $ Pages; function nbsp; vol () {nested class, nested arrays and classes, confused, solving This post was last edite

For tag nested loop instance selection, for tag nested instance Next,Light B2C e-commerce websitesUse nested loops to customize product display instances Purpose: To display up to 18 items on one page, three items per line Query Nested loop custom output Master cyclic slave 0To @ {List: getLength}(Length of the sch

In the format of the complex JSON data, the JSON data is often nested, so that the value will be slightly more complex than the previous value, but as long as the idea is clear, in fact, the method is the same. Just like if Else statement, if the IF in the set if,if if, write the specification is OK, if the code format is not standardized, then we must also look at the trouble. So, for JSON nesting, just remember the symbol ":" is the key, after the s

Mysql exists subquery can be divided into: from where and exists subquery www.2cto.com classification table: [SQL] mysql> select * from category; + ---- + --------- + | id | c_name | + ---- + --------- + | 1 | ios | 2 | android | 3 | sb | + ---- + --------- + 3 rows in set item table: www.2cto.com [SQL] mysql> select * from goods; + ---- + --------- + -------- + ------- + | id | name | cat_id | price | num

I went to an interview with two cool Internet companies a few days ago and encountered problems in SQL. Well, unfortunately, let's take a look at it. Score 1. Use group Group by Dimension For example: Calculate the total score of each student. SELECT student, SUM (score) FROM score group by student Average score for each student SELECT student, AVG (score) FROM score group by student You can also follow the class and Course2. Differences between having and where: having is similar to wh