t3 concentrator

(ID) 6); Table created. sql> CREATE TABLE T2 (2 ID number not NULL, 3 t1_id number is not NULL, 4 n number, 5 pad VARCHAR2 (4000), 6 CONSTRAINT T2_PK PRIMARY key (ID), 7 CONSTRAINT t2_t1_fk FOREIGN key (t1_id) REFERENCES T1 8); Table created. sql> CREATE TABLE t3 (2 ID number not NULL, 3 t2_id number is not NULL, 4 n number, 5 pad VARCHAR2 (4000), 6 CONSTRAINT T3_PK PRIMARY key (ID), 7 CONSTRAINT t3_t2_fk FOREIGN key (t2_id) REFERENCES T2 8); Tab

created.SQL> CREATE TABLE t2 ( 2 id NUMBER NOT NULL, 3 t1_id NUMBER NOT NULL, 4 n NUMBER, 5 pad VARCHAR2(4000), 6 CONSTRAINT t2_pk PRIMARY KEY(id), 7 CONSTRAINT t2_t1_fk FOREIGN KEY (t1_id) REFERENCES t1 8 );Table created.SQL> CREATE TABLE t3 ( 2 id NUMBER NOT NULL, 3 t2_id NUMBER NOT NULL, 4 n NUMBER, 5 pad VARCHAR2(4000), 6 CONSTRAINT t3_pk PRIMARY KEY(id), 7 CONSTRAINT t3_t2_fk FOREIGN KEY (t2_id)

Mysql view execution plan-explain MySQLexplain BitsCN. comauthor: skate Time: 2012/02/17 View execution plans in Mysql I. Syntax Explain Example: explain select * from t3 where id = 3952602; II. explain the output + ---- + ------------- + ------- + ------------------- + --------- + ------- + ------ + ------- + | Id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | + ---- + ------------- + ------

MYSQL Tutorial: Explain usage MySQLexplain I. SyntaxExplain Example: explain select * from t3 where id = 3952602;II. explain the output Program code+ ---- + ------------- + ------- + ------------------- + --------- + ------- + ------ + ------- +| Id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |+ ---- + ------------- + ------- + ------------------- + --------- + ------- + ------ + ------- +1. id 1. my understandi

Mysqlexplain BitsCN.com I. Syntax Explain Example: explain select * from t3 where id = 3952602; II. explain the output + ---- + ------------- + ------- + ------------------- + --------- + ------- + ------ + ------- +| Id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |+ ---- + ------------- + ------- + ------------------- + --------- + ------- + ------ + ------- + 1. idMy understanding is the mark of the smooth exec

a protocol for the transmission of PPP packets on the Ethernet network (point to point Protocol over Ethernet) in line with the operation of narrowband dial-up Internet (using NAS devices to terminate a user's PPP packet). After the introduction of this protocol, network equipment manufacturers have also launched their own brand of broadband access server (BAS), which can not only support the end of the PPPoE protocol data packets, but also support many other protocols. such as the Huawei Com

Mysql Explain here to do a comprehensive collation of the data. I. Grammar Explain For example: Explain select * from T3 where id=3952602; Two. Explain output interpretation +----+-------------+-------+-------+-------------------+---------+---------+-------+------+-------+| ID | Select_type | Table | Type | Possible_keys | Key | Key_len | Ref | Rows | Extra |+----+-------------+-------+-------+-------------------+---------+---------+-------+----

the Internet normally.PPPoE Protocol process analysis process diagramThe PPPoE protocol mainly involves the following processes: Created with Rapha? L 2.1.2 Customer Customer Server Server PADI PADO PADR PADS Descripti

quantity, T10.fnumber BOM material code, t10.fname BOM material name, T6.fnumber feed single material code, T6.fqty quantity of feeding order, T7.fqty picking list quantity, T7.soutfprice picking price, t7.soutfamount picking amount,T2.fdate application date, T2. Seefbillno application number, T2.fnumber application material code, t2.fqty application quantity, t3.fdate purchase date, T3.sefbillno purchase

] operator [operator to be overloaded] (function parameter ){//......} There are several methods to overload operators: global operators overload functions and global operators overload functions. The compiler first checks whether the operation is an object and then looks for it from the class.Member operator overload Function, If not found, it will go to the global searchGlobal operator overload function. Note: Operator overloadCannot be changedOriginal OperatorPriority Operator overloadCan

in time. 1:nrf51822 layering of Bluetooth protocols Application layer:Speed Cadence, Blood pressure, heart rate, thermometerBattery, Proximity, HID over GATT Master protocol layer:GATT GAP ATT SMP l2cap Control layer:Host Controller Interface (HCI)Link Layer (LL)Physical Layer (PHY) 2.1.1 RoleIn order to create and maintain a BLE connection, the concept of "role" was introduced. A BLE device is not a concentrator role or a peripheral device.Role,

I. GrammarExplain For example: Explain select * from T3 where id=3952602;Two. Explain output interpretation+----+-------------+-------+-------+-------------------+---------+---------+-------+------+-------+| ID | Select_type | Table | Type | Possible_keys | key | key_len | ref | rows | Extra |+----+-------------+-------+-------+-------------------+---------+---------+-------+------+-------+1.idThe SQL execution sequence is identified, and S

philosophy of narrowband dial-up Internet access ), A Protocol for transmitting PPP data packets Over Ethernet is developed ). After the launch of this protocol, network equipment manufacturers have also launched their own brands of Broadband Access Server BAS). It not only supports the termination of PPPOE protocol data packets, but also supports many other protocols. For example, Huawei's MA5200 small BAS) and ISN8850 big BAS ). PPPOE Protocol Introduction The PPPOE Protocol provides a standa

access ), A Protocol for transmitting PPP data packets Over Ethernet is developed ). After the launch of this protocol, network equipment manufacturers have also launched their own brands of Broadband Access Server BAS). It not only supports the termination of PPPOE protocol data packets, but also supports many other protocols. For example, Huawei's MA5200 small BAS) and ISN8850 big BAS ). PPPOE Protocol Introduction The PPPOE Protocol provides a standard for connecting multiple hosts to a Remo

stop script is called, JAVA serialized data is sent to weblogic;You can use ObjectInputStream. readObject to parse JAVA serialized data;The first few bytes of the T3 data sent by weblogic are the data length;Replace a serialized data in the T3 data sent by weblogic with a malicious serialized data, so that weblogic can execute the specified code.0x03 Vulnerability AnalysisJAVA serialization data packet cap

T_student T1 Left JOIN T_score T2 On t1.sid = T2sid Group BY T1sid,t1.sname; 4, inquire the surname "Li" the number of teachers; Select COUNT (Distinct (tname)) from T_teacher where tname like ' li% '; 5, the inquiry did not learn "cotyledons" teacher class students of the school number, name; Select Sid, Sname from T_student Where Sid not in ( SELECT DISTINCT (T1.SID) from T_score t1,t_course t2,t_teacher T3 where t1.cid = t2.cid and

normally.PPPoE Protocol process analysis process diagram The PPPoE protocol mainly involves the following processes:Created with Rapha rjl 2.1.2 explanation of PADIPADOPADRPADS on the client server Host broadcast initiation group (PADI). The destination address of the group is the Ethernet broadcast address 0 × ffffffffffff, the CODE field value is 0 × 09, and the SESSION-ID (session id) the field value is 0 × 0000. The PADI group must contain at least one service name type tag (the value of

null for connection · Reject the logic and One condition can deny null for one Outer Join Operation in a query, but does not deny null for the other. In the following query: SELECT * FROM T1 left join T2 ON T2.A = T1.A Left join T3 ON T3. B = T1. B WHERE T3.C> 0 The WHERE condition rejects null for 2nd Outer Join Operations, but does not reject null for 1st Oute

reject null for connection· Reject the logic andOne condition can deny null for one outer join operation in a query, but does not deny null for the other. In the following query:SELECT * FROM T1 left join T2 ON T2.A = T1.ALeft join T3 ON T3. B = T1. BWHERE T3.C> 0The WHERE condition rejects null for 2nd outer join operations, but does not reject null for

Python -- Redis Set, python -- redisset1. unordered set Set operation. The Set operation is a list that cannot be repeated. 　　1.1 sadd (name, values) # Add elements to the set corresponding to name 　　1.2 smembers (name) # Obtain all members of the set corresponding to name. sadd ('s1 ', 't1', 't2', 't3', 't1') print (r. smembers ('s1') # output {B 't1 ', B 't2', B 't3 '} # The set is deduplicated. 　　1.3 sca