teradata create table with primary key

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MySQL in a library multiple table query primary key

Tags: MySQL primary keymysql> show databases;mysql> use INFORMATION_SCHEMA;Mysql> Show tables;Mysql> select * from Key_column_usage; This step is to query the information for each table in each library.Mysql> SELECT * from key_column_usage where table_schema= ' table_name ' and constraint_name= ' PRIMARY '; Query for required tables based on criteriaThis article

Primary key design issues for table-timed tables on SQL Server

. Because the field is to be the primary key for a table, the first condition is to ensure uniqueness in the table. At the same time, combining the characteristics of the SQL Server database itself, you can create a self-adding column for it:

Oracle Master-Slave table primary foreign key correspondence relationship

First, let's take a look at what is the primary foreign key?1. Primary key: Uniquely identifies a row in a data table1) There can be only one primary key in a table. If you establish a

Table in Oracle database set PRIMARY KEY auto-increment

There is no self-increment field in Oracle, which can be implemented indirectly via sequence + trigger, Sqlplus login in cmd and run directly. It usually takes a few steps:1 Creating a data sheetCreateTabletest_increase ( useridnumber (10) primarykey, /* primary key, automatically add */ username varchar2 20 ); 2 Creating an auto-grow sequenceCREATESEQUENCE testincrease_sequenceINCREMENTBy1--Add a few e

Oracle&&sqlserver Get table name names primary key and data type

Tags: IO data for AMP SQL type on OracleSQL Server obtains data types such as column name, column type, column type length, Scale,prec, and so on (Syscolumns,systypes,sysobjects are all views)Select A.name as ColName, b.name as typename,a.length as length,a.scale as scale,a.prec as Prec from syscolumns a,systypes b, sysobjects C where A.xusertype=b.xusertype and a.id=c.id and c.name = ' TableName ' ORDER by c.idOracle obtains data types such as column name, column type, column type length, SCALE

About the unique constraint on the violation of a primary key caused by a trigger to an extended table insert

error is that the trigger and DML statements are in the same transaction management, so scenario one is to split the triggers and DML statements into two separate transactions. Pragma autonomous_transaction can be used here; Tells Oracle triggers to be custom transactions. CREATE trigger or replace Tab_b_tri After update on Tab_bFor each rowDeclare--This is the key place to specify custom transactions, whe

. NET MVC Table Primary foreign key relationship JSON Infinite Loop Scheme II (recommended)

public class Jsonresultobject:jsonresult {private Newtonsoft.Json.JsonSerializerSettings Settings { Get Private set; } public Jsonresultobject () {Settings = new Newtonsoft.Json.JsonSerializerSettings {referenceloophandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore} ; public override void Executeresult (ControllerContext context) {if (context = = NULL ) throw new ArgumentNullException ("context"); if (this. Jsonrequestbehavior = = Jsonrequestbehavio

Paging Statement-Take the 31st to 40th record in the SQL table (the auto-Grow ID is the primary key)

() {} Finnaly { if (rs!=null) Try{rs.close ();} catch (Exception e) {} if (STM ...). If (CN ... ...). } 3. Scrollable cursors pagesize=20; PageNo = 5; CN = NULL stmt = null; rs = null; Try { Sqlserver:sql = "SELECT * from articles"; DataSource ds = new InitialContext (). lookup (Jndiurl); Connection cn = Ds.getconnection (); "SELECT * from user where id=?" --->binary directive PreparedStatement pstmt = cn.preparesatement (sql,resultset.type_scroll_insensitive,...); Depending on the exception

When implementing delete primary table data, determine if the foreign key table associated with it has a data reference, a flag, and no delete

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 bit, if not used to delete directly, how to achieve this process well. It's best to automatically adapt to changes in the table Probl

SQL query database table name, table column name, data type, primary key

systypes table, the general user uses the data type to use the Xusertype correspondence is better, does not appear one to many the situation.(c) Syscolumns.length gets the length of the physical memory, so the types of nvarchar and varchar are displayed in the database in half.24.25.4. Get the column names contained in the primary key in the

In an Oracle database, you know a table that queries a table with its primary foreign key relationship

Label: --Check the foreign key table Nc56.csci there is no corresponding primary key table SELECT A.owner, a.table_name primary_table_name, a.constraint_name Primary_table_key_name, B.owner,

MySQL Create federated primary key

Tags: info create tab creat ONS int const NEW Create1. Create PRIMARY KEY syntaxALTER TABLE table_name ADD CONSTRAINT pk_name PRIMARY KEY (column name);2. Creating FOREIGN

Problems in the design of the primary key of SQL Server table

. Because the field is to be the primary key for a table, the first condition is to ensure uniqueness in the table. At the same time, combining the characteristics of the SQL Server database itself, you can create a self-adding column for it:

MySQL InnoDB Index Organization table & PRIMARY KEY function

Tags: Update lots Why code method SOF insert key value InitialInnoDB Index Organization table I. Index organization TABLE definition In the InnoDB storage engine, tables are organized according to the primary key order , which is called the Index Organization

MySQL foreign key and cascade delete && table storage engine with CREATE INDEX && delete database and table

Label:Messages table:Mysql>create Table Messages (->message_id int Auto_increment primary KEY,->user_name varchar () NOT NULL,->author_id int NOT NULL,->body text,->forum_id int not NULL);Forums Table:Mysql>create Table Forums (->

Foreign key names in the same database when you create a foreign key table cannot use the same

CREATE TABLE day_news (id smallint unsigned auto_increment, title varchar (), content text, author varchar (20 0), Num int unsigned default 0, ntime int unsigned, CNAME varchar (x), hotarticle enum (' Y ', ' n ') default ' n ', Flag enum (' Y ', ' n ') default ' Y ', primary key (ID), Constraint NFK foreign

MySQL gets the primary key for the other table

Label:Typically, after inserting an insert operation on MySQL in the app, we need to get the self-increment primary key for the inserted record. This article describes the 4 ways in which the Java environment obtains the value of the record primary key auto_increment after insert: The InsertRow () method prov

SQL Server database table primary key design

of database is a very broad problem. This paper mainly aims at the present situation of the author's development and Application, and discusses the problems and corresponding solutions to the design of table's primary key when designing the table on MS SQL Server. 2. Primary key

When you use navicat v8.0 to create a database, the foreign key error 1005: Can't create table (errno: 121) is returned)

error 1005: Can't create table (errno: 121) Errno 121 means a duplicate key error. Probably the table already exists in the InnoDB internal data dictionary, though the. frm file for the table has been deleted. This isMost common reason for getting errno 121 in

A brief discussion on the master table int self-added primary key Insert Record method

Insert master table The most common is probably used in Invoicing, MRP, ERP inside, such as a sales orders, order orders (Id,orderdate), Order Details OrderDetail (OrderID, ProductID, Num,price) This is probably the simplest master table, two tables are associated with OrderID by ID, where the primary key ID is the sel

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