Read about teradata create table with primary key, The latest news, videos, and discussion topics about teradata create table with primary key from alibabacloud.com
For example, because a commodity table and an Attribute Table have many-to-many relationships, a commodity attribute intermediate table exists. CREATETABLEIFNOTEXISTSdslxs_goods_attr (goods_idmediumint (8) unsignedNOTNULLCOMMENT #039; item id #039;, attr_idmediumint (8) unsigne... for example, because a commodity table
withno_logDBCCshrinkdatabase (database name)execsp_dboption \'database name \', \'autoshrink\', \'true\'
\\\'Add field General function Sub AddColumn (tablename,columnname,columntype) Conn.execute (\ "Alter Table \" tablename\ "add \" columnname\ "\" columntype\ "\") End Sub \\\'Change the field general function Sub Modcolumn (tablename,columnname,columntype) Conn.Execute(\"Alter Table\"TableName\"Alter C
The following error occurred today when you created a table with a federated master build:
ERROR 1075 (42000): incorrect table definition; There can is only one auto column and it must be defined as a key
Mysql> CREATE TABLE ANIMALS1 (
-> grp ENUM (' Fish ', ' mammal ', ' b
Label: Introduction This article focuses on the use of sequences in Oracle if you create a self-growth table. Create Tabletb_student (ID Number(Ten) not NULL, Createtime DATE not NULL,
constraintPk_tb_studentPrimary Key(ID)); Comment on Table"Tb_student" is
' StudentTab
1. Create a new tableCREATE TABLEYsb_log (ID Number(8)Primary Key not NULL, Tbdatevarchar( -)NULL, Tb_timevarchar( -) not NULL, Tblogvarchar( -) not NULL, Tbreorvarchar2( -)NULL, BSvarchar( -) not NULL );In Oracle, sequence is the so-called serial number, which is automatically incremented each time it is taken, and is typically used where serial numbers need
1, deletion of primary key
ALTER TABLE tablename Drop Primary_key
executes the above SQL to delete the primary key, and if it is unsuccessful,
ALTER TABLE tablename drop CONSTRAINTS COLUMN CASCADE; --delete constraint
ALTER
A database table commonly has a column, or group of columns, that uniquely identifies each row in the table. This identifying column or group of columns is called the primary key.A data table has one or several columns, and each table can have fields that uniquely identify c
');View field information for a tableDESC table name; Show columns from table name;View all information for a tableShow create table table name;Add a PRIMARY KEY constraintALTER
server add primary key (ID); ALTER TABLE zhangnq=# Select Relname,relhaspkey from Pg_class where relname= ' server '; relname | relhaspkey ---------+------------ server | t (1 row) To view the description of Pg_class, it turns out that Pg_class is automatically modified only when the status is changed from False to Ture. This design can improve concurrency.
Tags: style http color io strong for AR artAdd a table fieldALTER TABLE table1 add transactor varchar (ten) not Null;ALTER TABLE table1 add ID int unsigned not Null auto_increment primary keyModify the field type of a table and specify empty or non-emptyALTER
[If you have a satisfactory answer, you will receive extra points.] you only need to select a primary key for sorting on the table browsing page in PHPMyAdmin. you cannot select a primary key for sorting. This post was last sorted by shendaowu from 2013-04-0621: 32: 01 I use
"Satisfied answer will be added" phpmyadmin in the table under the Browse page as long as the primary key ordering, you can no longer select the primary key ordering
This post was last edited by Shendaowu on 2013-04-06 21:32:01
I'm using the XAMPP v3.1.0 Windows edition.
I f
1. Why composite primary key ing?In reality, we may encounter many tables that do not have a primary key. What kind of results will we use after ing them? Can we get what we want? The expected result is not obtained, and the following error may be returned:
Caused by: org. hibernate. AnnotationException: No identifier
SQL: the primary key of a data table is of the varchar type and does not increase itself. how can I insert a primary key when inserting data? SQL: the primary key of a data
Question: Suppose there is a student score table (TB) as follows:Name Course ScoreZhang San language 74Zhang San Mathematics 83Zhang San Physics 93Zhang Sande language nullJohn Doe Language 74John Doe Mathematics 84John Doe Physics 94John Doe English 80Want to become (get the following result):Name Chinese mathematics Physics English German----------------Lee 474 84 94? 60Zhang 374 83 93 80?Here name and course determine only one record, as the
Tags: news specify table generation development reference scope. COM Latest getDuring the development process, the primary key of the main table is self-increment, it is necessary to get increment value in order to insert the Word table data, get the following three kinds of
Tags: style http color io strong for AR Art Div www.169it.comAdd a table fieldALTER TABLE table1 add transactor varchar (ten) not Null;ALTER TABLE table1 add ID int unsigned not Null auto_increment primary keyModify the field type of a
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.