dumping data for table

A) Easy to type, update efficiency:Update table1Set Field1=table2.field1,field2=table2.field2From Table2 where table1.id=table2.idb) Conventional way, this is equivalent to a left join, in the outside where is the number of updates, if not add where is all recordsUpdate table1 Set field1=(select top 1 field1 from table2 where table2.id=table1.id)where table1.id in (condition)SQL Server Update table (data fo

Basic MySQL Data Table operation 2: Table Structure View, modification, and table operation 1. view the data table structure 1) view the basic table structure statement DESCRIBE Syntax:

logical and physical structure of Oracle database The logical structure of an Oracle database is made up of database objects, such as database table spaces, tables, indexes, segments, views, stored procedures, triggers, and so on. The logical storage structure of a database (table space, etc.) determines how the physical space of a database is used, and database objects such as tables, indexes, etc. are dis

Oracle clears table data quickly, Oracle clears table dataOracle Quick Clear table dataI. Introduction Table data deletion usually involves three common commands: truncate, delete, and drop. However, their execution methods, effi

Oracle table connection-No data is displayed in the other table during the connection process. oracle-related data A data table is basically difficult to meet our query requirements. At the same time, it is not a good database des

-uroot-p-d-b TestDB >testdb.sql[SQL] view plain copy 650) this.width=650; "Src="/e/u261/themes/default/images/ Spacer.gif "alt=" on code to see the "width=" "height=" "style=" Background:url ("/e/u261/themes/default/images/word.gif ") No-repeat center;border:1px solid #ddd;"/>650) this.width=650; "Src=" Https://code.csdn.net/assets/ico _fork.svg "alt=" Derivation to My Code slice "width=" "height=" "style=" background-color:inherit;margin-top:8px; "/> DROPTABLE IF EXISTS ' test '; CREATE

(1): Query whether a table exists in a database ( two ways): Assuming that the table name is table_nameif exists (select * from sysobjects where name= ' table_name ')DROP TABLE table_nameIf OBJECT_ID (' table_name ') is NOT nullDROP TABLE table_nameThe same operation can also be used to determine whether the database e

',' submission_date ' date default NULL,PRIMARY KEY (' tutorial_id '),UNIQUE KEY ' Author_index ' (' Tutorial_author ')) Type=innodb1 row in Set (0.00 sec)ERROR:No query specified Step 2:Rename this table and create another table The code is as follows Copy Code mysql> CREATE TABLE ' clone_tbl ' (-> ' tutorial_id ' int (one)

This article mainly introduces how to copy data from a data table in MySQL to a new table. This article describes the existence of a new table and the absence of a new table, for more information, see if MySQL does not support SEL

--Table data query---- basic query of data ---- simple query of data --SELECT * | field name [, field Name 2, ...] from data table name [WHERE condition expression]Cases:Use Commodity Management databaseGoSELECT * From commodity i

Partitioning1 is suitable for processing large amount of data, such as TB class2 to improve reading and writing and query speed of mega database3 users can create tables by applying partitioning techniques to save data in a partitioned form4 partitioning is the separation of large tables or indexes into relatively small, independently managed parts. The partitioned tabl