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Delete Deletes multiple table data, how can you delete data from multiple relational tables at the same time? Here's an in-depth explanation: 1. Delete from T1 where condition 2, delete t1 from T1 where condition 3, delete t1 from T1,t2 where condition 4, delete

Delete Deletes multiple table data, how can you delete data from multiple relational tables at the same time? Here's an in-depth explanation: The code is as follows Copy Code 1 delete from T1 where condition2 delete t1 from T1 where condition3 Delete t1 from

Label:This morning and colleagues hot debate, arguing about the lock on a few basic concepts. Record lock, Gap lock, Next_key lock At that time, I found myself understanding the lock more thoroughly: The isolation level of the transaction is through the lock to achieve AH. RC: Record lock onlyRR: With record and Next_key lock Now let's talk about the lock implementations of various SQL statements in RR mode: CREATE TABLE t1 (ID int primary KEY auto_in

(); (1) /* (2 )*/ Try { Thread. sleep (3000 ); } Catch (InterruptedException e ){ System. out. println ("Interrupted "); } } } } Public class TestThread { Public static void main (String [] args ){ TestThreadMethod t1 = new TestThreadMethod ("t1 "); TestThreadMethod t2 = new TestThreadMethod ("t2 "); T1.setPriority (Thread. MAX_PRIORITY ); T2.setPriority (Threa

article, we solved the deadlock problem in that scenario. This time, let's analyze why the deadlock occurs? Let's review the two SP statements:Create proc P1 @ P1 intSelect C2, C3 from T1 where C2 between @ P1 and @ P1 + 1GoCreate proc P2 @ P1 intUpdate T1 set C2 = C2 + 1 where c1 = @ p1Update T1 set C2 = c2-1 where c1 = @ p1Go Strange! P1 has no insert, no Dele

Comparison between four methods for batch ORACLE update and four methods for oracle update Software Environment Windows 2000 + ORACLE9i Hardware environment CPU 1.8G + RAM 512 M Now we have two tables: T1 -- large table 10000 T1_FK_ID T2 -- small table 5000 T2_PK_ID T1 is associated with the primary key ID of T2. The simulation data is as follows: -- T2 contains 5000 pieces of data Create table T2 As Selec

One, function From the beginning of contact with JS feel good flexible, everyone's writing is different, such as a function on the N-type such as: function ShowMsg () {},var showmsg=function () {},showmsg=function () {} There seems to be no difference, is the same, really the same, we look at the following example Copy Code code as follows: ///----------------------------------------------------------------------------------------- ------- function definition: named funct

) Other transactions cannot read table, update and deleteCross-read transactions use row versioning.Use snapshot Isolation.Use a bound connection.-----------------------------Analyze and resolve SQL Server deadlock issues (cont.)Above, we solved the deadlock problem for that scene. This time, let's analyze why we have a deadlock. Look again at the two SP notation:CREATE PROC p1 @p1 int asSELECT C2, C3 from T1 WHERE C2 between @p1 and @p1 +1GOCREATE PR

Tags: style io color using SP strong data on 2014Clear Oralce cache: Alter system flush Buffer_cache;Environment: Oracle 10g, 4 million data, frequency 5 minutes1. Application scenario: Find the latest data for all sites. The SQL statements are as follows:——————————————————————————————————————————————————With AA as (Select T1. EQP_ID, Max (measure_time) Maxtm from Plu_water_data t1 where

BSTNode * lchild, * rchild; } BSTNode, * BSTree; Status SearchBST (BSTree T, ElemType e) // find Void R_Rotate (BSTree p) // right-hand Void L_Rotate (BSTree p) // left-hand Void LeftBalance (BSTree T) // insert Balance Adjustment Void RightBalance (BSTree T) // insert Balance Adjustment Status InsertAVL (BSTree T, ElemType e, int taller) // insert Void DELeftBalance (BSTree T) // Delete Balance Adjustment Void DERightBalance (BSTree T) // Delete Balance Adjustment Status Delete (BSTre

1. Delete all records with IDs in Table T2. DELETEt1FROMt1, t2WHEREt1. idt2.id or DELETEFROMt1USINGt1, t from MySQL table T1. 1. DELETE all records with IDs in Table T2. DELETE t1 FROM t1, t2 WHERE t1.id = t2.id or delete from t1 USING t