t3 concentrator

521DThere are three strategies for upgrading skills: 1, =; 2, +=;3, *=. The optimal order of upgrades is obviously first using strategy 1, then strategy 2, and then strategy 3.Assignment increment (for each skill only considers the maximum gain assignment operation), plus the multiply (for each skill to give priority to the maximum gain of the addition), in the premise of not exceeding the overall upgrade scheme, the selection of M-type of the largest multiplier of the upgrade scheme. Since the

can be solved at the application layer. Ii. explain the output + ---- + ------------- + ------- + ------------------- + --------- + ------- + ------ + ------- + | Id | select_type | table | type | possible_keys | key | key_len | Ref | rows | Extra | + ---- + ------------- + ------- + ------------------- + --------- + ------- + ------ + ------- + 1. id My understanding is the mark of the smooth execution of SQL statements, from large to small. For example: Mysql> explain select * from (select *

, the basic as much as possible to reduce the join, subqueries and so on. MySQL uses the simplest query , which is the most efficient. As for join, you can put it in the application layer to solve Two. Explain output interpretation +----+-------------+-------+-------+-------------------+---------+--------- +-------+------+-------+ | ID | Select_type | Table | Type | Possible_keys | Key | Key_len | Ref | Rows | Extra | +----+-------------+-------+-------+-------------------+---------+-----

General Idea:MySQL does not have a convenient statistical function like Oracle, can only rely on their own hard computing: through the Time field directly increase the year, the month, and then through the left join associated Time field to calculate the chain, year-over formula can beOriginal table structure:Find sql:[SQL]View PlainCopyPrint? --by year SELECT t5.*, Case when t5.last_energy_year is NULL OR t5.last_energy_year =0 Then 0.00 ELSE FORMAT (((t5.energy_year-t5.last

This article will discuss the similarities and differences between simple nested queries and non-nested queries in SQL, through which you can better understand SQL statements. One day's work was to fix the bug of a project, and then we found that its SQL statements were extremely messy, there were a lot of left join and in operations, and nested queries had only one table nested query ). I don't know where I have seen it. The nested query is slow, so I changed all the nested queries to join. I w

Round 1day1:Today, the examination room played a big mistake, a little summing up a bit.Get the title, a long time did not do 4 questions, the first idea is to do it quickly, rhythm to a little faster.A glance at the T2, ah relatively simple digital DP, a little push will be able to launch it.T3t4 seems to be a divine problem, first put, and then take part of the points.Then go to the battle T1, think of a very naked and violent n^1.5 algorithm, a bit silly dozen a monotonous queue, there are a

1001, HDU 5327 OlympiadPlay a table check-in question. The degree of opening 4minFB ...There should be a more optimized method, in order to hand speed without tle on the line ... = =1002, HDU 5328 zzx and permutationsAP: Linear sequenceGP: equal-ratio sequenceThe length of the maximum sequence of AP and GP is calculated by the ruler, then the maximal value can be obtained.It is important to note that the equivalence is best used in a proportional way rather than in division, because the sample,

() effect Select DISTINCT * from (select t1.mi_id, T3. I_identity_card, SUM (NVL (t2.is_visheartpromember, 0)) over (PARTITION by T3. I_identity_card) Pro_num, SUM (NVL (t2.is_visheartexpmember, 0)) over (PARTITION by T3. I_identity_card) Exp_num, SUM (NVL (t2.is_visheartpolmember, 0)) over (PARTITIO

then the checkpoint write is completed. Then accept the new transaction. Similar to this: for example, if there are currently two T1 T2 transactions, write them in undolog: Undolog Start T1 Start T2 When the checkpoint cycle is reached, you have to wait until T1 and T2 are all submitted, and then write the checkpoint chkpoint. That is, if there is a T3 to be enabled, it cannot be enab

variables that appear in double quotes are automatically parsed.$sql = "SELECT * from oneself WHERE name like '%{$colname _recordset1} ' LIMIT {$startRow _recordset1}, {$maxRows _recordset1} ";$Recordset 1 = mysql_query ($sql) or Die (Mysql_error ());{} on both sides of the variable is directly indicating that this is a variable and the name of the variable, if the variable effect of the array type is more obvious, it may cause an array variable name resolution error. Full article Search CREA

;##########################################################################################One, multi-table query1.1 Copying tablesRole? Backup tables and Quick build tablesCommand format? CREATE TABLE Library. Table SQL query command;Example?CREATE TABLE Db3.user2 select * from Db3.usertab;CREATE TABLE Db3.user3 Select Username,uid,shell from Db3.usertab limit 5;Create Database DB4;CREATE TABLE DB4.T1 SELECT * from db3.usertab where 1 = 2;CREATE TABLE Db4.t2 Select Id,username,uid,homedir from

, statistics and billing, IP Address Allocation (allocated when dialing) ◆ point-to-poi in PPPoE The abbreviation of nt protocol over ethernet allows an ethernet host to connect to a remote access concentrator through a simple bridge device. ◆ Using PPPoE protocol, remote access devices can control and charge each access user ◆ it is widely used in a series of construction projects such as community networking, currently, the popular broadband access

until t1,t2 all submitted, and then write to Checkpoint Chkpoint. That is, if there is a T3 to open now, it cannot be opened. The system is in a tamper state. After writing, turn on T3, logging as follows: Undolog Start T1 Start T2 End T1 End T2 Chkpoint Start

, Hive supports writing converted data directly to different tables, and writing to partitions, HDFS, and local directories This eliminates the overhead of scanning the input tables multiple times. from T1 Inserts OVERWRITE TABLE T2 SELECT t3.c2, COUNT (1) from T3 WHERE t3.c1 GROUP by T3. C2 INSERT OVERWRITE D

an entire table or partition, such as the following: INSERT OVERWRITE TABLE T1 SELECT * from T2; • Use the LOAD statement to insert new data.5. Hive does not support insert into table values (), update,delete operationBecause data is stored in HDFs, these operations are not supported, and hive does not require a sophisticated locking mechanism to read and write data.6. Hive supports embedding a mapreduce program to handle complex logicFor example From ( MAP doctext USING ' Python wc_mapper.py '

thread ends due to an exception, a new thread will replace it. This thread pool ensures that all tasks are executed in the order they are submitted. Test Case: We create a Text thread for testing: class Text implements Runnable{ String name; public Text(String name){ this.name = name; } @Override public void run() { System.out.println(Thread.currentThread().getName() + "--" + name); } } Now let's test the effect of the threa

battery is spit groove decadent, but I do not do anything, the phone is not electricity at the beginning. Back to the computer room and wildrage in the supermarket to buy the revenge of the society's dirty bag, it is very dirty, but also very tasty, and then began to review the FFT board, but not very skilled, and hit a bit of WC interactive problem, and then eat back to the hotel. Went back to the hotel for a while "Water Problem Walk quartet" went to bed.Day 1:The exam due to the reasons for

parameterdeferred_segment_creation Name type value ----------------------------------------------------------------------------- Deferred_segment_creation Boolean true SQL> Create Table T1 as select * fromdba_users; Table created. SQL> Create Table T2 as select * From dba_userswhere 1 = 2; Table created. SQL> Create Table T3 as select * fromdba_users where 1 = 2; Table created. SQL> select table_name from tabs where table_namein ('T1 ', 't2', '

not appear in the result set, and is displayed as null. SQL Total Syntax basic syntax (full outer join) SELECT * FROM table 1 full OUTER JOIN table 2 on table 1.userid= table 2.userid SQL Leftist syntax Description: The above SQL full-link meaning is to display table 1 and table 2 all the rows, to put it simply, is the table 1 and table 2 all the rows together, then filter out duplicate data and display in the result set. Okay, let me see. Performance comparison inline, leftist, right, full