non compound

I haven't touched the underlying details of the database for a long time. A little guy came to me a few days ago and had to say that the compound B * tree index branch block only contains the key value information of the pilot column, it does not

Alias Overview php5.3+ Support namespaces: namespace, one of the important functions of namespaces is that you can use aliases to refer to a rule-compliant name. Namespaces support the form of alias references in 3 (or referred to as introduction):

#include #includevoidList ();voidA ();voidB ();voidC (); main () {intsel; List (); printf ("\ t Please select:"); while(SCANF ("%d", &sel)! =1|| sel1|| Sel>4)//prevents the input of a character and the number entered is not an integer 1~4{printf

CREATE PROCEDURE P5 ([ ] name1 data-type, ... , [] Namen data-The argument list can be either empty or multiple, keyword in | Out | INOUT, can be omitted, default in.1. In input

SummaryWhat is a single index and what is a composite index? When to create a composite index? This article mainly summarizes some discussions on the Internet.1. ConceptsA single index refers to the case where the index column is one column, that is,

Oracle compound index + null index usage problems, oracle Index Yesterday, I discussed an SQL Optimization Problem in the QQ group. The statements are roughly as follows: Select A, min (B) from table group by;-- Neither A nor B has the not null

JUnit4.8.2 source code analysis-5.1 Statement compound command Abstract class StatementCommand in Command mode, There is only one public synchronized actvoidEvaluate() Throws Throwable; As the Runner of Invoker in command mode, various Statement

Hql Query methodThis is one of my most used and favorite, because it is flexible and intuitive to write, and not much worse than the syntax of the familiar SQL. Conditional query, paged query, connection query, nested query, write up and SQL syntax

Transferred from: http://blog.csdn.net/iijse/article/details/6161143Hql Query methodThis is one of my most used and favorite, because it is flexible and intuitive to write, and not much worse than the syntax of the familiar SQL. Conditional query,

The function return value is a number, a number may represent a case, or it can represent multiple case combinations. The return value rule is as follows: Conditions Decimal number Binary number