teradata create table as select

This article provides three SQL statement instance code to create a table, one by one example test and explain how to use SQL to create a datasheet and database tutorial Description instance. Use [master] Go if exists (select 1 from sysdatabases where name=n ' hktemp ') Begin Drop Database Hktemp--If a database

TABNAME add primary key (COL)--delete primary key ALTER TABLE tabname drop p Rimary Key (COL)--Creating an index create [unique] index idxname on tabname (COL)--delete index drop indexes idxname/* create BBSDB database */use Masterif Exists (SELECT * from sysdatabases where name= ' bbsdb ') BeginPrint ' database has b

the application. The basic difference is that the MyISAM type does not support advanced processing such as transaction processing, and InnoDB type support. The MyISAM type of table emphasizes performance, which is performed more quickly than the InnoDB type, but does not provide transactional support, while InnoDB provides advanced database functionality such as transactional support and external keys. InnoDB provides MySQL with transactional (commit

. Each table can have only one auto_increment column, and it must be indexed.Another turn:Typically, an attempt to create a table that already exists will produce an error. In both cases, however, there is no error. In the first case, if the IF not EXISTS clause is given, the table that already exists is not created, b

the following SQL query: The Code is as follows: Copy code create table wishers ( id number not null, name varchar2(50) unique not null, password varchar2(50) not null, constraint wishers_pk primary key(id)); To create a wishes table, run the follo

member; Grant succeeded. Jssweb> revoke unlimited tablespace from member; Revoke succeeded. Jssweb> CREATE TABLE MEMBER.DT_TBL1 as select object_id id,object_name name 2 from All_objects where rownum Table created. Jssweb> commit; Commit complete. Note that the schema of the object in the tablespace to be rep

: create table Name (Field 1 Data Type [DEFAULT value], Field 2 Data Type [DEFAULT value],… ..., Field n data type [DEFAULT value]); www.2cto.comCreate a member table (member) with the following information: name, age, birthday, and personal profile. Create table member (nam

What is a table?? Table: tableLogically, each table contains rows and columns in the database. The table can be 0 rows, but at least one table must support index query. Physically, each table is saved on a disk by one or more file

|+ ---------- + -------------- + ----------------- + ------ + ----- + --------- + ------- + ------------------------------- + --------- +| Number | int (11) | NULL | YES | NULL | select, insert, update, references || Name | varchar (255) | utf8_general_ci | YES | NULL | select, insert, update, references || Birthday | date | NULL | YES | NULL | select, insert, u

Data modeling of Enterprise Architect 8 (CREATE TABLE) ---------- 1. We create a view of the database modeling 1.1 The New Diagram window, select Extended on the left select from and select data types in the right diagram modeling

does not exist, it is automatically created. This is equivalent to create.Create-create a target table and add records to it. If the target table already exists, an error is returned.Insert-insert a record into an existing target table. Unlike append, if the target table do

(7)CONSTRAINT s_dept_id_pk PRIMARY KEY,Name VARCHAR2 (25)CONSTRAINT S_dept_name_nn not NULL,region_id Number (7)CONSTRAINT S_DEPT_REGION_ID_FK REFERENCES Region (ID),CONSTRAINT S_dept_name_region_id_uk UNIQUE (name, region_id));8. More complex examples of creating tablessql> CREATE TABLE s_emp(ID number (7)CONSTRAINT s_emp_id_pk PRIMARY KEY,Last_Name VARCHAR2 (25)CONSTRAINT S_emp_last_name_nn not NULL,Firs

To create a mysql dynamic table, first check whether the table exists. Use the SQL statement :?? 1. SHOW? TABLES? LIKE? % Tb_bp_d_case % ;?? 2. select 'table _ name' from 'information _ scheme'. 'tables' where 'table _ scheme' dbn

null, City varchar (+) default ' Qingdao ', Area int Check (area >=300 and area ) CREATE TABLE Db_table10 ( warehouse number int identity (1, 1) primary key, warehouse number varchar () collate french_ci_ai NOT NULL, City varchar (+) Default ' Qingdao ', area int check (area >=300 and area The warehouse number is a sort field where CI (case insensitive) means case-insensitive, and A

Create a table The Simple Way Copy Code code as follows: CREATE TABLE Person ( Number INT (11), Name VARCHAR (255), Birthday DATE ); Or is Copy Code code as follows: CREATE TABLE

S_dept_name_nn not NULL,region_id Number (7)CONSTRAINT S_DEPT_REGION_ID_FK REFERENCES Region (ID),CONSTRAINT S_dept_name_region_id_uk UNIQUE (name, region_id));8. More complex examples of creating tablessql> CREATE TABLE s_emp(ID number (7)CONSTRAINT s_emp_id_pk PRIMARY KEY,Last_Name VARCHAR2 (25)CONSTRAINT S_emp_last_name_nn not NULL,First_Name VARCHAR2 (25),UserID VARCHAR2 (8)CONSTRAINT S_emp_userid_nn n

This article starts with the basics to help you open the MySQL database door. 1. use the SHOW statement to find out the existing Database: SHOWDATABASES; + ---------- + | Database | + ---------- + | mysql | test | + ---------- + 3 rowsinset (0.00sec) 2. create a database abccs: mysqlCREATEDATABASE This article starts with the basics to help you open the MySQL database door. 1. use the SHOW statement to find out which database exists at the moment:

partition alter table t_test drop partition t_test_2014 Note: During droppartition, the data stored in the partition will also be deleted. your intention is to delete the specified partition but keep the data. You should use merge partition, if you execute this statement, the glocal index becomes invalid and you need to re-create the global index.2.3 merge partitions Adjacent partitions can be merge as

Create a partition:/***** create a partition table *****/create table sales (dopetno number, shopid varchar2 (20), shopname varchar2 (20), tdate date) partition by range (tdate) (partition p_2007_min values less than (to_date ('00:00:00 ', 'syyyy-MM-DD hh24: MI: ss ', 'nls _

:= ' SELECT COUNT (*) from user_tables where Table_name= ' ' | | v_tablename| | ';Dbms_output.put_line (V_SQLFALG);Execute immediate v_sqlfalg into V_flag;If V_flag=0 then--if there is no this table to createBeginExecute immediate ' CREATE TABLE ' | | V_tablename | | '(DATETIME DATE,MIN00 FLOAT,AGV00 FLOAT,MAX00 FLOAT,