sql commands

---restore content starts---1 Database operations1: Creating Databases: Create DATABASE 2: Display database show databasess (note that there is a last s)3: Delete Database drop 2 Table Operation:2.1 Get Table structure: desc or Show columns from 2.2

DB2 clearing the database sequence cacheAlter sequence wfr.wfr_bill_histories_s NoCache;Create a script that empties all table dataSelect ' ALTER TABLE ' | | RTRIM (Tabschema) | | tabname| | ' Activate not the logged initially with empty table; '

Knowledge Points:One, SQL command DDL (structured operation)Ii. SQL command DML operations (add and revise)1.sql Command DDL (structured operation)1.1 Table Add Field:ALTER TABLE table name add column definitionSuch as:ALTER TABLE Student add email

1, Multi-Table association:-- 方法1.UPDATE表2SET  表2.C  =  (SELECTB  FROM表1  WHERE表1.A = 表2.A)WHERE  EXISTS ( SELECT1 FROM表1  WHERE 表1.A = 表2.A)  -- 方法2MERGE INTO表2 USING 表1ON( 表2.A = 表1.A )    -- 条件是 A 相同WHENMATCHED THENUPDATESET表2.C = 表1.B   -- 匹配的时候，

The name of Ef4.1,api has changed slightly, and Dbcontext.database is the encapsulation that corresponds to the database-side information. The Execute SQL command also naturally starts with the Database type. corresponding to Executestorecommand and

1. Data definition language (DDL) Cerate table ALTER TABLE drop table CREATE index Alter index Drop Index CREATE view Drop view 2. Data manipulation Language (DML) Insert Updte Delete 3. Data Query Language

SQL Introduction SQL supports the following categories of commands: 1. Data definition Language (DDL) 2. Data Manipulation Language (DML) 3. Transaction Control Language (TCL) 4. Data Control Language (DCL) Here are the detailed notes for these four

Common SQL commands @ oracle Data Type summary @ permission, role, User Creation and use @ pseudo column and precautions 1. user system permissions with different permissions: User name: sys/system (the default user name is sys, system); Password:

On the Linux platform, you can use the up and down arrows on the keyboard to call up the SQL commands executed in history at the SQL * PLUS command line prompt of the Oracle database, you can consider using the rlwrap open-source tool. Now, record

Common SQL commands:(1) Data Record Filtering:SQL = "select * from data table where field name = Field Value Order by field name [DESC]"SQL = "select * from data table where field name like/'% Field Value %/'order by field name [DESC]"SQL = "select

How to use SQL commands to view the Mysql database size bitsCN.com To know the size of each database, follow these steps:1. enter the information_schema database (storing information about other databases)Use information_schema;2. query the size of

Select [stuid], [Stuno], [Name], [Sex], [Age], [Address], [Telphone]From [ufmeta_001]. [DBO]. [Student]Go Insert into student values (101, 'hangsan ') Insert into student values (102, 'hangww', 'hangsan ') Insert into student values (103,

Oracle learning notes 4 SQL commands (2): SQL operation language category, oracle learning notes SQL is classified into the following language categories1. Data Definition Language (DDL)Create, Alter, Drop 2. Data manipulation language (DML)Insert,

Oracle learning notes 3 SQL commands, oracle learning notes SQLSQL introduction SQL supports the following types of commands: 1. data Definition Language (DDL) 2. data manipulation language (DML) 3. transaction Control Language (TCL) 4. the Data

server|sqlserver| Data | data type | Transformation Why don't you let SQL Server help you automatically convert data types in SQL commands DATE:2003/12/5 Prepared by: Zheng Article Last modified on 2004-2-16 the information in this

First, the MySQL database daily operation.1. Start Mysql:/etc/init.d/mysql Start (the installation path in front of MySQL)2. Restart MySQL:/etc/init.d/mysql restart (the installation path in front of MySQL)3. Turn off MySQL:/etc/init.d/mysql stop

XML Auto Features and T-SQL commands As a DBA, I tend to focus on performance issues, so I want to make sure that using XML (an Extensible Markup language) does not have an impact on performance. In this article, I'll show the difference in

Half a month ago, I wanted to write down the SQL commands I used!!!Topics: Query by Time: 41863349 Left Association: SELECT * FROM Uesrs-time_entries to "on users. ' id ' = time_entries. ' users_id '-user table associated timesheets minus the same

1. Change the content in the articleUpdate dede_addonarticle set Body=replace (body, ' original character ', ' replaced character ')2, replace the article titleUpdate dede_archives set Title=replace (title, ' original character ', ' replaced

To know the size of each database, proceed as follows:1. Access to the INFORMATION_SCHEMA database (information on other databases)Use INFORMATION_SCHEMA;2, query the size of all data:Select Concat (Round (sum (data_length/1024/1024), 2), ' MB ') as