learning sql o reilly

options must be turned on when creating the view and all the underlying tables; Any function that the view references must be deterministic; 7, must add with SCHEMABINDING, is bound to the schema. 8. After creating the view, you must immediately create a clustered clustered unique index, and must be in the first column (the first column is a unique value, similar to the primary key). 9. Only two-part named tables or UDFs, such as DBO, are supported. SalesOrder. 10. When multiple table

;adding departmental information simplifies adding only valid data -InsertID= "Savedept">INSERT INTO dept_p (dept_id,dept_name,parent_id,state,create_time,update_time) VALUES (#{deptid},#{deptname},# {parentdept.deptid},#{state},#{createtime},#{updatetime})Insert>Query information by Department ID -SelectID= "Finddeptbyid"Resultmap= "DEPTRM">SELECT * FROM (SELECT * to Dept_p) dleft JOIN (select dept_id as p_id,dept_name as P_name from dept_p) PON d.parent_id =p.p_idwhere Dept_id=#{deptid}Select>

'; V_sql_updateVARCHAR2( $):='UPDATE stuinfo SET name=:1,sex=:2 where Id=:3';BEGIN EXECUTEIMMEDIATE v_sql_update USING v_name,v_sex,v_id;IFSql%ROWCOUNT > 0 Then COMMIT; Dbms_output.put_line ('OK'); END IF; EXCEPTION whenOTHERS ThenDbms_output.put_line (SQLERRM);END;--The binding order in the using is consistent with the order in which the statements are executedSELECT * fromStuinfo;--Dynamic QueryDECLAREStu Stuinfo%ROWTYPE, Cur_r sys_refcursor; v_id stuinfo.id%TYPE:=ID; V_sql_selVARCHAR2( -)

result set based on the specified column.The order BY statement sorts records by default in ascending order.If you want to sort records in descending order, you can use the DESC keyword. SELECT Company, OrderNumber from Orders ORDER by company SELECT Company, OrderNumber from Orders ORDER by company, OrderNumber SELECT Company, OrderNumber from Orders ORDER by company DESC SELECT Company, OrderNumber from Orders ORDER by company DESC, OrderNumber Desc INSERT into state

name and value of the attribute. This is called serialization of large object blocks.The advantage of this design is extensibility, and the disadvantage is that SQL cannot get a specified property in such a structure. You have to either the entire BLOB field and the program to interpret the attributes.When you need absolute flexibility, you can use this scenario.If you use EAV, you can first take all of the attributes out and then do other processing

Label:View1. Creation of views ? ? A view is a saved SELECT statement that, when executed, results in a new table, so the view and table are not treated differently in SQL, which means that SQL can do some work on the views. ? ? Because the view does not actually save the data, just save the execution of the SELECT statement, you can save storage space, but for the large data volume of storage, using the vi

Very good SQL statement learning manual instance version Very good SQL statement learning manual instance version Table operations Example 1 Table STUDENTS in the table teaching management database can be defined as follows: The Code is as follows: Create table students (sno numeric (6, 0) NOT NULL Sname char (8)

Tags: Insert learning notes for dynamic SQL operations1 Import java.util.ArrayList; Import java.util.List; Import org.apache.ibatis.session.SqlSession; Import Cn.itcast.javaee.mybatis.util.MybatisUtil; /** * Persistence layer * @author ADMINTC */public class Studentdao {/** * insert student */public void Dynainsert (Studen T student) throws exception{sqlsession sqlsession = null; try{

Although learning slowly, but also need a step-by-step study.Study notes:1. SQL statement is not case sensitive2. MySQL requires a semicolon;3. Used commands:show databases;//shows how many databases are created database First_lesson;//Create a database using First_lesson;//Use this database to show tables;// Shows how many tables describe person;//display the contents of the header in a tableInsert into wh

the page has value to the servlet? So, his argument should be the name attribute set on the input on the page. The problem is that Gradeid does not match the fault of the newspaper. So why gradename-----gname can run? ---------------------------------------------------------------------------------------- 5. Why does the blank appear when I finish modifying my name? Answer: This question is still an extension of the last question. Just said above, why Gradeid do not match will error, and Gra

Name Name fieldCREATE TRIGGER employee_updateon employeeafter updateasbeginif (UPDATE name) BeginPrint ' prohibit modification of employee names! ' ROLLBACK TRANSACTION --roll back all operations before this node and proceed to the following statement EndEndVerifyUPDATE Employee SET name= ' XX 'Maintenance backup of the databaseUsing stored procedures to create a backup deviceEXEC sp_addumpdevice ' DISK ', ' comb ', ' E ' \data\comb. BAK 'Deleting a backup deviceEXEC sp_dropdevice ' comb 'To c

=http%3a//www.xdcms.com/index.php%3fm%3dmember%26f%3deditcookie=phpsessid%3d7urapqfnc9cchs31lfu38u0pi4%3b %20member_user%3dxdcms%3b%20member_userid%3d3opener= http/1.1 "200 3View the background database, found that the code is written to the database, do not know whether the storage-type XSS??? In summary, this will send cookie information to the XSS platform each time the page is refreshed.0x02 SQL injection TestThe code of the time background PHP,

ISQLLOCALDB info ["Instance name"] View all, or specify the instance nameVersion vSQLLOCALDB versionTracking TTrace On|off turn on database tracking2. Manage LOCALDB using SQL Server Management Studio (SSMS)Let's say we create a new instance named test01, and then we see this with info: the instance pipeline name: Np:\\.\pipe\localdb#7a15dcd7\tsql\query Here, copy the NP-beginning content to the server name, Then authentication selects Windows to con

If there is a commodity table goods in the database, store more than one item informationWhen executing SQL statementsSELECT * from goods where id = 1;The query result is of course a piece of dataWhen executing SQL statementsSELECT * from goods where id = 1 or 6;What will be the result of the execution???As a result, all commodity information data is queried.This is only a query operation, if it is maliciou

hiredate= ' 1 July-December-80 '--2. Show transformations--2.1to_char () Conversion of datesSelect To_char (sysdate, ' Yyyy-mm-dd hh24:mi:ss ') from dual;--2.2to_char () Conversion of numbersSelect To_char (Sal, ' l9,999.99 ') from EMP--Four. numeric functions--1.round (): RoundingSelect Round (12.45,1) from dual--2.trunc: TruncateSelect Trunc (15.79,1) from dual--Five. General functions--NVL and NVL2 Filter empty functionsSelect Sal*12 Salary, comm Bonus, SAL*12+NVL (comm,0) from EMP;Select Sa

1, SQL In addition to the group by grouping data, SQL also allows filtering groups, rules include those groups, exclude those groups. For example, you might want to list all customers with at least two orders. To do this, the filter must be based on a complete grouping instead of individual rows.Based on the above example, the first time we think about is to filter the data by using where, to get the result

between the department and the employee is stored. The foreign key is just a constraint that guarantees the validity of the data, and the foreign key needs to be built on the relationship column. Script Script execution shortcut keys Ctrl+e SQL is mainly divided into DDL (database definition Language building tables, building libraries and other statements), DML (Database manipulation language) and DCL (Database control Language). CreateTable, alte

One-step learning of LINQ to SQL (1): prerequisites Http://www.cnblogs.com/aehyok/archive/2013/04/11/3015506.html One-step learning of LINQ to SQL (2): datacontext and Entity Http://www.cnblogs.com/aehyok/archive/2013/04/12/3015678.html Step by step to learn about LINQ to S