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Tags: a primary new. com strong tar database var divThe select into statement selects data from one table and then inserts the data into another table, often to create a backup copy of the table or to archive records. --to make a backup copy of the "Persons"
Tags: mysql create table Delete table EclipseMySQL Create and delete tablesCreate a tableThe Simple WayCREATE TABLE Person (number INT (one), name VARCHAR (255), birthday DATE);or aCREATE TABLE IF not EXISTS person (number INTone)
] tbl_name [([column_definition],... | [index_definition])] [table_option] [select_statement]; Note: ● temporary: This keyword indicates that the table created with the create Command is a temporary table. A table created without this keyword is usually called a persistent table
(p1);
This command can tell you whether the data or indexes in the partition P1 of the table T1 have been corrupted. If this happens, use the ALTER TABLE ... REPAIR PARTITION "to patch the partition. Get partition information
The partitions in the MySQL server information database holds the partition information for all tables in the server.
Copy Code code as follows:
Explain partitions com
Create a tableThe Simple WayCREATE TABLE Person (number INT (one), name VARCHAR (255), birthday DATE);or aCREATE TABLE IF not EXISTS person (number INT one), name VARCHAR (255), birthday DATE);To view the MySQL creation table:SHOW CREATE table person;
filename "Teaching management" and choose the saved path as "E/example".
(3) Click the Create button.
The new database opens, creating a new table named "Table 1" and opening it in Datasheet view.
(4) In Datasheet view, double-click the Add New Field column heading and enter the new field name "Name" in the table,
getElementByTagName method like all element objects. You can use element. getElementsByTagName (tagname) to obtain a list of all child elements of an element and select them using the tag name.Element. getElementsByTagName returns a list of child elements with specific tag names. You can obtain an element from the child element list by calling an item method (passing an index parameter to it. Note that the index of the first child element in the list
--Today there is a need to write a-test: Create DATABASE [DB1] CREATE DATABASE [DB2] use [DB1] Create TABLE [dbo]. [Table1] ([id] [int],[name] [varchar]) CREATE TABLE [dbo]. [Table2] ([id] [int],[name] [varchar])
Tags: des blog http io file data for art"1" SQL Server setting primary key self-growing column SQL Server setting primary key self-growing column 1. Create a new data table with field ID, set ID as primary key www.2cto.com CREATE TABLE TB (ID int,constraint pkid PR Imary key (ID))
Temporary tables can be very useful, in some cases, to maintain temporary data. The most important thing to know is that the temporary table is that they will be deleted when the current client session terminates
When you create a temporary table, you can use the TEMPORARY keyword. Such as:
The code is as follows
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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 a partition. The lower boundary of the new partition is a partition with a lower boundary value, and the upper boundary is a partition with a higher boundary value. The o
as parameters.
(6) a user-defined table type cannot be used as a table-valued parameter to call user-defined functions.
For example:
/* Create a user-defined table type */
Create type orderitem $ UDT as table (
Orderid int pr
) Statement 1 is generally used for two table structure of the same situation, and statement 2 is used in the case of inconsistent table structure;3) The field1,field2 involved in statement 1 must also exist;4) If Table2 has a primary key and does not have automatic growth, then field1, field2 ... Must include the primary key.Example:Mysql>CREATE
SQL creates a new table from an existing table, the new table structure is the same as the existing table structure, but not the data in the existing table!The execution of DML statements depends on the database type:SQLITE-----Copy tabl
and maintained by the userContains information about the userData dictionaryCollection of a series of tables created and maintained by the Oracle serverContains information about the database
Data typeThe data type that represents the character: CHAR (n), VARCHA2 (n), Lang,clobA data type that represents a number: numbers (p,s): P is precision, S is scaleRepresents the binary data type: raw or long raw, BLOB, BFILEData type that represents the date: date, TIMESTAMP, interval: year to month, d
---------------------------------------------------------------------------------- ----------------------------------------------------------------------------------------------------------- ----------------------------------------------------------------------------- If exists (SELECT * FROM sysdatabases WHERE name = ' guest ') drop database, Go Create database Guest, on primary ( name = ' ', filena
. Example 1: CREATE GLOBAL Temporary TABLE tbl_user_transcation (ID number, uname VARCHAR2 (a), Usex VARCHAR2 (2), Ubirthday DATE) on C Ommit DELETE ROWS; session-level temporary tables To create a session-level temporary table, you need to use the on COMMIT PRESERVE rows clause, and the record of the session-level t
keyword for a table
3, an internal function of to_date:oracle, you can change the string into time
Copy Code code as follows:
Insert into Business (busino,businame,itemno,starttime)
VALUES (4, ' Supermarket ', 2,to_date (' 2008-08-08 ', ' yyyy-mm-dd '));
4. Create a table with "unique" and "conditional" constraints
Copy Code code
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