A few questions about SQL (SQL advanced) and SQL advanced
When we get a question, we are not eager to answer the question. It will not be worth the candle, but to analyze the ideas, methods, and objectives, we also need to think about whether there are simple methods or general methods to achieve the same effect. In fact, this kind of inertial thinking was introd
like '% @ str %'Create an encrypted stored procedure or function WITH the with encryption parameter before theYou can use sp_decrypt to decrypt encrypted stored procedures and functions.10. View user and process information in the databaseSp_whoView information about active users and processes in the SQL Server databaseSp_who 'active'View the locks in the SQL Server databaseSp_lockProcess No. 1--50 is used
Often develop ASP but for the meticulous statement, the truth is not very clear, here a simple introduction.
Under normal circumstances
Read the data with Rs.Open sql,conn,1,1
Modifying data: Rs.Open sql,conn,1,3
Delete data: Directly to Conn.execute ("Delete * from new where id=1").
The Rs.Open syntax is as follows: Rs. Open Source,activeconnection,cursortype,locktype
Source is a
Tags: ash text results SQL tuning SRC completion need to end TunA few days ago, a user developed QQ to find me, as follows:The free Dolphin. 16:12:01The island owner, my SQL can not find the results, could you help me see?Orchid Island Main 16:12:10How long is the result?The Free Dolphin 16:12:17How long has not produced the result, has not seen the result.Orchid Island Main 16:12:26Oh, good.Orchid Island M
I often develop asp, but I am not very clear about the detailed statements. Here is a brief introduction.
Generally
Rs. open SQL, conn, are used to read data.
Modify data: rs. open SQL, conn, 1, 3
Delete data: You can directly delete data such as conn.exe cute ("delete * from new where id = 1.
Rs. Open Syntax: rs. Open Source, ActiveConnection, CursorType, LockType
Source is an
Label: conn =mysqljdbcutils.getconnection (); Statement PS=conn.createstatement (); Ps.addbatch ("Truncate Qb_showcount_asite_copy");
Ps.executebatch (); String Srcsql= "SELECT Convert" (Unhex (Hex (CONVERT (Community using latin1)) using UTF8) as Community, PID from Qb_menbercmmsets_list whe Re site=7 "; stmt=conn.preparestatement (Srcsql); RS=Stmt.executequery (); Above is the empty command that executes before the following SQL statement executes//
Tags: nbsp play clob Introduction ring LAN Solution Help SED 1. Brief introduction Oracle DATABASE11GR1 introduces SQL Planmanagement (SPM), a set of new tools that allow DBAs to capture and maintain discretionary SQL statements to run the best plan, limiting refresh optimizer statistics. There has been an application change. Even the impact of a database version number upgrade. This article helps to unders
SQLServer how to use the T-SQL command to query a database in which tables, convenient table operations, need friends can refer to the next
SQLServer how to use the T-SQL command to query a database in which tables, convenient table operations, need friends can refer to the next
1. query all tables in SQL:
Select TABLE_NAME FROM database name. INFORMATION_SCHE
SQL Server database management common SQL and T-SQL statements
1. view the database version
Select @ version
2. view the operating system parameters of the machine where the database is located
Exec master .. xp_msver
3. view database startup parameters
Sp_configure
4. view the database startup time
Select convert (varchar (30), login_time, 120) from master .. sy
SQL connections (2) -- SQL Reading Notes, SQL Reading Notes
Chapter 1 in SQL Learning Guide
1.4 outer connections
In multi-table join, the connection condition may not match all rows in the table. For example, when the account table is connected to the customer table, the value of the cust_id column in the account tabl
SQL UNION operatorThe UNION operator is used to combine the result set of two or more SELECT statements.Note that the SELECT statement inside the UNION must have the same number of columns. The column must also have a similar data type. Also, the order of the columns in each SELECT statement must be the same.SQL UNION SyntaxSELECT column_name (s) from Table_name1unionselect column_name (s) from table_name2Note: By default, the UNION operator chooses a
Static SQL, dynamic SQL, and static SQL
Static
1. Common MemberCommon members belong to objects.Call with object
2. Static membersStatic members belong to the classCalled by Class Name
Class FenBi{Public int length; // common memberPublic string color ;//}
Static keywords
Static methods cannot contain common members.
The common method can contain static members.
1. query all tables in SQL:
Select TABLE_NAME FROM database name. INFORMATION_SCHEMA.TABLES Where TABLE_TYPE = 'base table' after execution, you can see the names of all tables created by yourself in the database.
2. query all tables and columns in SQL:
Select dbo. sysobjects. name as Table_name, dbo. syscolumns. name AS Column_name FROM dbo. syscolumns inner join dbo. sysobjects ON dbo. syscolumns. id
Label:The more written the SQL script, the more often it feels that writing is too inefficient, regardless of the speed of the typing. When I personally write SQL scripts, I will at least arrange the SQL format to be easy to read, because others will read your SQL, whether in the program or in the script file, good typ
Use of PL/SQL DBMS_ SQL package (1) (Study Notes), pldbms_ SQL
Dbms_ SQL packageThe dbms_ SQL package is another method provided by the system to use dynamic SQL:Follow these steps to use the DBMS_ SQL package to implement dynamic
In fact, this is also a problem at work. To tell the truth, I am not willing to do it myself. I also want to write statements for queries, but I have not thoroughly studied this kind of information,Write SQL statements in JavaProgramAt the same time, I chose to be lazy.
First, if it is golden, of course there is no need to say that the Direct Write statement is similar to select. If it is PL/SQL, it is not
1. Query all tables in sql:
Select table_name from database name. Information_schema. Tables Where table_type= ' BASE table ' is executed, you can see the names of all the tables in the database that belong to you
2. Query all tables and columns in sql:Select Dbo.sysobjects.name as TABLE_NAME, dbo.syscolumns.name as column_name from Dbo.syscolumns INNER JOIN dbo.sysobject s on dbo.syscolumns.id = Dbo.sysobjects.id Where (dbo.sysobjects.xtype = '
Database: ms SQL Server 2005
Task: ms SQL Server 2005 database log files are too large and need to be cleared.
Method:
Backup log [your database name] With no_logBackup log [your database name] With truncate_onlyDBCC shrinkdatabase ([your database name])
Note:
Backup log specifies that only transaction logs are backed up. This log is backed up from the last successfully executed log to the end of the c
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