drop table tablename

In Oracle10g, If you accidentally drop a table, Can you restore it? The answer is yes. In Oracle10g, when you run the drop table tablename command, the table will not be deleted, instead, the table is stored in the recycle bin (the concept of the

The source of this article: http://www.cnblogs.com/wy123/p/6704619.htmlIssue backgroundIn a write SQL Server stored procedure, if a temporary table is defined in the stored procedure,Some people are used to explicitly delete a temporary table

Select| comparison Table TableName must exist when insert INTO TableName Table cannot exist when select * into tablename The SELECT * into TableName is fast when the database failover model is simple, because select * into tablename does not

In Oracle10g, If you accidentally drop a table, Can you restore it? The answer is yes. In Oracle10g, when you run the drop table tablename command, the table will not be deleted, instead, the table is stored in the recycle bin (the recycle bin

CREATE TABLE tab2 as (SELECT * from TAB1)The storage engine for this practice table also uses the server's default storage engine instead of the source table's storage engine, which copies the contents of the table together.CREATE talbe tab2

DB2 Alter Table introduction and use of normal Table modification and creation, you need to consider the following two situations: 1. when data is stored in a table, you can only modify the Data Type of the column to a compatible data type, or keep

In SQL Server performance tuning, there is an aspect problem: How do you work with temporary datasets in code that takes a long time or is frequently called? Table variables and temporary tables are two choices. Remember that a large number of

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If the hive version is not a support drop table TableName Purge.Your drop TABLE command would move data to. Trash in HDFs.Dfs. Trash;drop TABLE TableName;Dfs. Trash/current;#batch drop tables you want in hive.Hive--database databasename-e "Show

CREATE TABLE tab2 as (SELECT * from TAB1)The storage engine for this practice table also uses the server's default storage engine instead of the source table's storage engine, which copies the contents of the table together.CREATE talbe tab2