sql interview questions book

procedure and a trigger Triggers are very similar to stored procedures, and triggers are also sets of SQL statements, the only difference being that triggers cannot be invoked with an EXECUTE statement, but are automatically triggered (activated) when a user executes a Transact-SQL statement. A trigger is a stored procedure that executes when a data in a specified table is modified. Pass- through creates t

Interview question: give you a text file, which stores 100 million QQ numbers, please use the program to order from small to large, Khan Ah!.. Interview question: give you a text file, which stores 100 million QQ numbers, please use the program to order from small to large, Khan Ah!.. Ask the master to explain the idea! There are other questions: For example, the

Hibernate Interview Questions and answersEssence-a large collection of Hibernate Interview Questions and answers1. What is the matching relationship between the relational data model and the Object Model (multiple choice) in general)A) table corresponds to Class B) record corresponding object C) Table field corresponds

Hiring smart software developers is not easy.If you're not careful you might end up hiring a bunch of moronic Mandrills, like I did last year. and you don't want that. trust me. stand-up meetings are very hard to do in a tree. The key is to askChallenging questionsThat enable you to distinguish the smart software developers from the moronic Mandrills. And to help you with that, I decided to publish my private list100 interview

Oracle interview questions: complex queries and instance analysis When you need to perform complex processing on the queried results, you can obtain the expected results by means of joint queries and subqueries. The following is a typical question, which is intended to inspire readers.1. Question requirements: Table NBA records TEAM Name and year of the winning team: TEAM YEAR ----------------------------

multiple times, a new record is inserted due to the submission of other transactions, resulting in a different result of each query;The difference is:Unread read: Will cause dirty reading, non-repetition reading, phantom reading;Submit read: Will not cause dirty reading, but there will be non-repetition read, Phantom read;Repeat read: May cause phantom reading;Serial read: Does not cause dirty reading, non-repetition reading, phantom reading; - , there are large fields in the table X (for examp

[Classic Interview Questions] [dictionary tree] unique string prefix Question A file contains the following strings:CartefdxhCartCarlkijfweChdfwefCafkek.pdf............ Find the unique prefix that represents the string from the file, and then output the followingCartefdxh carteCartCarlkijfwe carlChdfwef chCafkekw.caf Separated by spaces ....... Ideas Use the Trie tree. Add a variable count for each node to

Interview questions: how to optimize MYSQL database queries and mysql databases. Interview questions: how to optimize MYSQL database queries. mysql database 1. how to optimize the data types in MySQL. if you are a DBA, you are waiting for an interview question based on the o

using parallelism in Core Data is that each NSManagedObjectContext must be accessed only from the process in which it was created . What is the difference between POST and GET for HTTP?The request for a get type is idempotent according to the HTTP protocol, while the POST request has side effects, that is, get is used to get some resources, and post is used to change some resources, which may create new resources or update existing resources.A POST request is more secure than a GET reques

I will summarize some common android interview basic questions to see how many questions can you make? 1. What are several intent startup methods? Do you understand each meaning? Here, Android123 reminds you that some Intent tags include FLAG_ACTIVITY_BROUGHT_TO_FRONT, FLAG_ACTIVITY_CLEAR_TOP, struct, struct, FLAG_ACTIVITY_MULTIPLE_TASK, and FLAG_ACTIVITY_NE

1. there are two columns A and B in the query question table during the interview. use SQL statements and practice. When Column A is greater than column Blie, select column A. Otherwise, select Column B selectid1 and id2 (casewhenid1id2thenid1elseid2end) asresultfromt4; similar problem: in Table t4, if id2 is greater than 3, the record is qualified, and if it is greater than 5, the record is excellent. Othe

Oracle interview questions 1. Simple SQL query: 1): count the number of employees in each department Select Dept, count (*) from employee group by dept; 2): count the number of employees in each Department greater than one record Select Dept, count (*) from employee group by dept having count (*)> 1; 3): the name of the department where the employee whose salary

Analysis of Three tricky Leetcode interview questions Recently, when I was idle, I click the Leetcode question to do it. I found that some questions are quite interesting and tricky. In the following three questions, each question seems so easy at the beginning! However, after further analysis, they all have some tips.

UNSIGNED NOT NULL PRIMARY KEY AUTO_INCREMENT, product_name VARCHAR(64) NOT NULL);CREATE TABLE orders ( product_id INT UNSIGNED NOT NULL , create_at INT UNSIGNED NOT NULL, num INT UNSIGNED NOT NULL ); Write an SQL statement to query the product name, total sales volume, and sort by the total sales volume from high to low in the T1-T2 period. My practices: SELECT products.product_name, number.numFROM ((SELECT product_id, sum(num)

This article mainly introduces the collection of typical PHP interview questions and collects common php interview questions and related reference answers for your reference, for more information, see this article. Share it with you for your reference. The details are as follows: I did some php

Android interview questions 1.Which of the following statements about memory reclaim are correct? (B) A,ProgramThe worker must create a thread to release the memory. B,The memory reclaim program is responsible for releasing useless memory. C,The memory reclaim program allows programmers to directly release the memory. D,The memory reclaim program can release memory objects at a specified time. 2

DBA classic interview questions (1) 1: List several table join Methods: hash join, merge join, nest loop join (cluster join), and index join 2: no third-party tools, how to view the SQL Execution Plan set autotrace on if the following error occurs: SP2-0613: unable to verify PLAN_TABLE format or entity SP2-0611: Error executing oraclehome \ ora92 \ rdbms \ admin

Reprinted ETL architect interview questions 1. What is a logical data mapping and what does it mean to the ETL team? What is Logical Data ing? What role does it play on the ETL project team? A: Logical Data Map) describes the data definition of the source system, the model of the target data warehouse, and instructions on operations and processing methods to convert the data of the source system to the data

PB and Database interview questions First part: PB (PB6 ~ PB7) (10 points per topic) 1. Write a global function f_center (), and the parameter Aw_window to the window type so that it is centered automatically. 2. For information on how to access image or text type data in Pb, please give an example. 3. How to detect whether the data window has been modified. 4. Write a global function F_getparentwindo

Test your Java basic test questions: This is a few interview questions I designed. The requirement is that there should be as few questions as possible and they can be completed within five minutes, but it can basically reflect the level of knowledge of the interviewer. So I designed six questions.If you are able to fi