Is nickname the same as Alias?

A nickname is not an alias. An alias is a name that you have used as if it was your legal name. Many people who have been arrested have given fake names (aliases) hoping their prior cases would not show up.

What is difference between Alias and synonym in Db2?

A DB2 SYNONYM is also an alternate name for a table. Aliases can be accessed by users other than their creator, but synonyms can be accessed only by their creator. When a table is dropped, its synonyms are dropped but its aliases are retained.

What is nickname in Db2?

A nickname is an identifier that an application uses to reference a data source object, such as a table or view. In a federated system, you use can nicknames to access data source objects and improve the performance of queries on remote data sources.

What is an alias in Db2?

Alias is an alternative name for database objects. It can be used to reference the database object. You can say, it is a nick name for database objects. Alias are defined for the objects to make their name short, thereby reducing the query size and increasing readability of the query.

Can you have an alias?

Generally, a person is entitled to using an alias if they choose to do so. However, most legal documents that require proof or validity of identity may be necessary and often a legal name change is also legally needed. On the other hand, an alias is just a name that has not been legally assigned, but is used.

What is alias name example?

An example of an alias is when a person goes into the Witness Protection Program, and they have to assume a new identity with a new name so no one can find them. An example of alias is when one refers to the Dark Knight, or otherwise known as Batman. An assumed name. The swindler worked under various aliases.

Is synonym a Db2 object?

A synonym is an alternate name for a table or view. A synonym can be used to reference a table or view in cases where an existing table or view can be referenced. Synonyms are similar to aliases but are supported only for compatibility with previous releases Aliases behave the same for all Db2 family products.

What is Db2?

For indexes, EXPLAIN indicates how many indexes and index columns are used and what I/O methods are used to read the pages. For joins of tables, EXPLAIN indicates the join method and type, the order in which Db2 joins the tables, and the occasions when and reasons why it sorts any rows.

How do I drop an alias?

2 Answers

1. NAME. unalias – remove alias definitions.
2. SYNOPSIS unalias alias-name… unalias -a.
3. DESCRIPTION. The unalias utility shall remove the definition for each alias name specified. See Alias Substitution . The aliases shall be removed from the current shell execution environment; see Shell Execution Environment .

Where are Db2 aliases stored?

database directory
Database aliases are defined using the CATALOG DATABASE command and stored in the database directory. They can be created for local or remote databases.

Is having an alias illegal?

Using an alias or fictitious characters in business is a common practice. Using an alias or pseudonym is generally fine, as long as within the intrinsic nature of the alias there’s no false or misleading information, mentioned or implied, meant to induce the consumer to buy based on that information.

What is the purpose of alias?

Aliases provide database administrators, as well as other database users, with the ability to reduce the amount of code required for a query, and to make queries simpler to understand. In addition, aliasing can be used as an obfuscation technique to protect the real names of database fields.

What does an alias mean in DB2 for z / OS?

An alias in DB2 for z/OS can mean something different than LUW. In DB2 for z/OS, an alias can refer to what we in LUW call a nickname – a table on a remote server accessed using federation. Table aliases are easy to create.

What is the difference between DB2 UDB and DB2 OS / 390?

What are the differences between DB2 UDB and DB2 OS/390? Well, the two are comprised of completely different code bases. That means that the code is separate for the mainframe (z/OS and OS/390) DB2 and the distributed LUW (Linux, Unix, Windows) DB2.

When to use a synonym in DB2 server?

A synonym can only be defined on the name of a table or view at the current server. A synonym can only be defined on the name of an existing table or view. But dropping a table or view does drop its synonyms.A synonym can only be used at the DB2 subsystem where it is defined. Aliases can be thought of as alternative names for tables and views

Where do you use an alias in SQL?

An alias can be defined at a local server and can refer to a table or view that is at the current server or a remote server. The alias name can be used wherever the table name or view name can be used to refer to the table or view in an SQL statement.