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for the column PersonID --nameNamenvarchar( -) not NULL,--Create a column with Unicode non-fixed length (up to 20 Unicode characters stored) name --AgeAgeint not NULL CONSTRAINTCk_ageCHECK(age>= - andAge -) ,--Create an integer that constrains the check constraint to a column age --SexGenderbit not NULL CONSTRAINTDf_genderDEFAULT(1) ,--Create a colum
1. Build a table1 IF object_id (n ' table name ', n ' U ') is NULL CREATE table table name (2 ID INT IDENTITY (1, 1) PRIMARY KEY ,......);2. Query all tables that meet the criteria1 SELECT 2 NAME3from4 sys.objects5WHERE
/// /// Query Method/// /// /// Public dataset query (string tabnames, string columnname){Using (oraclehelper orahp = new oraclehelper ()){String [] tabs = tabnames. Split (',');Dataset DATA = new dataset ();Orahp. open ();For (INT I = 0; I {String tabtemp = tabs [I];String SQL = "select nvl (v. foreign key table, '"+ tabtemp +"') as foreign
Label:Iv. SQL PRIMARY KEY constraint PRIMARY KEY constraint uniquely identifies each record in a database table The primary key must contain
, we have seen that the existing structure has many drawbacks, mainly because of the complexity of the program, reduced efficiency, and unfavorable paging. To solve the preceding problem, this article proposes that when there is a master-slave relationship between the database tables in the background of the application system, a non-business field is added to the database table as the primary
Simple tutorial on SQL statements in linux --- primary key, foreign key, and SQL Primary Key)Each item in is a unique value in the table. In
The primary key of Table A acts as a foreign key in Table B. Who is the primary table and who is the subtable? A as the primary tableB is th
Tags: style blog ar color sp for on data divThe role of the primary and foreign keys of sql:Foreign key value rule: A null value or a reference primary key value.(1) When a non-null value is inserted, it cannot be inserted if the value is not in the primary
Many tables in SQL Server have foreign key constraints. before deleting these tables, you must first Delete these foreign key constraints. The stored procedure used to delete the foreign key constraints of a table:
, ' Cnstisupdatecascade '), cascade delete =objectproperty (a.id, ' Cnstisdeletecascade ')From sysobjects aJoin Sysforeignkeys B on A.id=b.constidJoin sysobjects C on a.parent_obj=c.idJoin syscolumns CNOn B.fkeyid = cn.id and B.fkey = Cn.colidWhere a.xtype= ' F ' and c.xtype= ' U 'and object_name (B.rkeyid) = ' dt_article '--FOREIGN key details source http://technet.microsoft.com/zh-cn/library/ms190196 (v=sql
primary KEY (Primary key) each of the data in the table is a unique value in the form. Other words. It is used to uniquely identify each row of data in a table.The primary key can be a
Tags: integrity alt otto ack article ble sql ima back primary KEY (Primary key) each of the data in the table is a unique value in the form. In other words, it is a unique way to identify each row of data in a
with UTF8 character setCREATE DATABASE IF not EXISTS ' db ' DEFAULT CHARACTER SET UTF8;--9. Deleting a databaseDROP DATABASE IF EXISTS ren2;DROP DATABASE IF EXISTS ren1;--10. View the DatabaseSHOW DATABASES;--11. Common Information functionsSELECT VERSION (); --Current database server version informationSELECT DATABASE (); --Query the current librarySELECT Current_User (); --View the current userSELECT USER (); --View the current userSELECT curdate (
column collection PRIMARY KEY has an automatically defined UNIQUE constraint Note that each table can have multiple UNIQUE constraints, but only one PRIMARY KEY constraint per table The following
illustrate how to use inner joins and nested queries to implement multi-table queries. In fact, all databases are the same, and SQL statements are generic.I. BASIC OBJECTIVESIt is known that in the test database, the school database can be self-contained, the following table exists:(1) The student table I_student, whi
Tags: http io ar os using for strong on dataAuthor: GW? Reprint annotated Source??The SQL statement creates the table format:? CREATE table?? ( ??? [,? [,? );??--above is the format of the table if you do not understand it is recommended to search the following regular expre
First, create a tabular format:Create Tabletable name (Whether the Field field type can be empty, ...); Comment on columnTable/Field isAn example of a comment:Create TableCompany (com_idINTEGER not NULL, Com_nameVARCHAR2( +)NULL, Com_addressVARCHAR2( -)NULL); Second, create a primary key/FOREIGN
Problem Description: A basic information table, with more than 30 tables in the system, there is a foreign key relationship, when the basic data to delete, you need to determine whether has been used, if used to change the flag, if not used to delete directly, how to achieve this deal well? It's best to automatically adapt to changes in the table Problem Resolu
My BSOOC need a query table primary key foreign key information of SQL, last night research to 1 o'clock in the morning, finally can achieve this goal: Oracle: Select O.obj# as ObjectId, o.name as TableName, oc.name as ConstraintName, Decode (c.type#, 1, ' C ', 2, ' P ', 3,
Summary When deleting data in a table with a parent-child relationship, we all know that you must delete the child table before deleting the data in the parent table. Yesterday we used to delete the child table first, then delete the parent table, delete the use of t
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