CREATE TABLE as SELECT * FROM and insert to select from two table copy statement differences[SQL]View PlainCopy
Create table targer_table as select * from source_table
INSERT INTO target_table (column1,column2) select Column1,column2 from source_table
The above two sentences are to insert the record of the source
If the data in one of the tables in your database meets the following criteria, you should consider creating a partitioned table.1. There is a lot of data in a table in the database. What are many concepts? 10,000 lines? 20,000 lines? Or 100,000 or 1 million? This, I think is the question of the benevolent see and the beholder. Of course, when the data in the data table
My Russian name is "do not toss uncomfortable", so, do not put the partition table A good toss, I am not comfortable.In the previous section, we discussed how to create a partitioned table directly and how to convert a normal table into a partitioned table. So what's the difference between these two ways of creating a
Copy a table to another table, view, and temporary table. create a new_table table with the same structure as an old_table table without the old_table record. create table new_table as select * from old_table where 1 = 0; create a
Label:In the previous section, we discussed how to create a partitioned table directly and how to convert a normal table into a partitioned table. So what's the difference between these two ways of creating a table? Now, I've created two more tables in a new way: The first table
Atitit does not respond when querying table modification table fields -- the unlocked Table query table does not respond when modifying table fields. If the gui does not respond, it is best to use the cmd method. If no gui is used, it is not necessary to lock the
In the field of data warehousing there is a concept called transaction fact table, the Chinese translation is generally "transaction fact table". The Transaction fact table is one of three basic types of fact tables in the Data Warehouse for dimension modeling, and the other two are the periodic snapshot fact table and
Single Table query, multi-Table query, and sub-query, single table
Query statement type:Simple QueryMulti-Table querySubquery (nested query)
Query syntax:
SELECT field_name: field_name indicates the field name. SELECT the column to be queried.FROM table_name: database_name indicates the database name. Select the data
1. Copy table structure and data to new table
CREATE Table New Table SELECT * from old tableThis method copies all the contents of the oldtable, and of course we can delete them with the delete from newtable.
But one of the worst aspects of this approach is that the new table
Tags: margin png ica timing color assignment weight for varchar The source of this article: http://www.cnblogs.com/wy123/p/6677073.html When doing data statistics database design, when considering the data storage, often encounter logically the same businessid corresponding to multiple data points of the situation,For example, the employee ID in the payroll and the payroll information, the individual report IDs in the financial table, and the informa
I. Detailed description of the MAC address table
Speaking of the MAC address table, you have to talk about the working principle of the switch, because the switch forwards data frames according to the MAC address table. There is a table in the vswitch that records the relationship between the MAC address of the LAN hos
In the data warehouse field, there is a concept called Transactionfacttable, which is generally translated into "transaction fact tables ". Transaction fact tables are one of the three basic types of fact tables in the data warehouse for dimensional modeling. The other two types are periodic snapshot fact tables and cumulative snapshot fact tables. The transaction fact table uses the same as the periodic snapshot fact
A: MAC Address Table detailedWhen it comes to the MAC address table, you have to say how the switch works because the switch forwards the data frame based on the MAC address table. There is a table in the switch that records the corresponding relationship between the MAC address of the LAN host and the switch interface
An ARP table is a dynamic table stored in a computer. It is used to correspond an IP address to a MAC address.Assume that computer A communicates with computer B in the same subnet segment.Computer A's IP address 192.168.0.1 MAC address AA-AA-AA-AA-AA-AAIP address of computer B known 192.168.0.2 MAC Address UnknownThen computer A will initiate an ARP query. "Who can tell me what the MAC address of 192.168.0
The whole solution of inheritance relation mapping in ORM--single table inheritance system, one entity one concrete table, one Entity one extension table, interface mapping
This article covers the following topics:
1. Single-Table inheritance system
2. One entity, one specific t
Tags: blog http io ar os using SP strong datapartition table in SQL Server 2005 (vi): Converting a partitioned table to a normal tableCategory: SQL Server2009-12-14 14:28 5210 People read comments (+) Favorites report SQL Servermergefunctionsql2010goMy Russian name is "do not toss uncomfortable", so, do not put the partition table A good toss, I am not comfor
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