What is alias in Db2?
An alias is a substitute for the three-part name of a table or view. 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.
What is operator in Db2?
The Db2 IN operator is a logical operator that compares a value with a set of values: expression IN (v1, v2, v3.) The IN operator returns true if the value of the expression matches one of the value in the list v1 , v2 , v3 … Otherwise, it returns false.
Can we use alias in where clause in Db2?
You can’t. This is a general rule of SQL. In practice, you can think of the reason being that the where is parsed before the select , so the aliases are not known.
What is the difference between alias and view?
View can be created with many tables, and with virtual columns and with conditions. But synonym can be on view. Alias is temporary and used with one query. Synonym is permanent and not used as alias.
What is index page size in DB2?
Compressed indexes can use 8 KB, 16 KB, or 32 KB buffer pools. When you use compressed indexes, more index leaf pages can be stored on a disk. The index leaf pages are compressed down from either 8 KB, 16 KB, or 32 KB to fit into a 4 KB page size. For an 8 KB index page size, the best compression ratio is 2:1.
What is mod in DB2?
The MOD function divides the first argument by the second argument and returns the remainder. MOD( numeric-expression-1 , numeric-expression-2 ) The schema is SYSIBM. The formula used to calculate the remainder is: MOD(x,y) = x – FLOOR(x/y) * y. Where x/y is the truncated integer result of the division.
Why we use AS in SQL?
The AS command is used to rename a column or table with an alias. An alias only exists for the duration of the query.
Why AS is used in SQL?
What is AS keyword in SQL?
SQL AS keyword is used to give an alias to table or column names in the queries. In this way, we can increase the readability and understandability of the query and column headings in the result set.
Why alias is used in the SQL?
SQL aliases are used to give a table, or a column in a table, a temporary name. Aliases are often used to make column names more readable. An alias only exists for the duration of that query. An alias is created with the AS keyword.
What is difference between alias and synonym in db2?
Authorization or the CREATE ALIAS privilege is required to define an alias. No authorization is required to define a synonym. 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.
What is Npages in DB2?
NPAGES is the number of pages of an existing table holding data within the database. This number is a proper indicator only when you have updated statistics recently.
What is modulo in SQL?
The MOD() function returns the remainder of a number divided by another number.
How do I get dividends in SQL?
For example, when 7 is divided by 3, then 2 will be returned.
- Syntax : SELECT x DIV y;
- Parameter : This method accepts two parameters as given below as follows.
- Example-1 : Getting quotient 2 when 7 is divided by 3.
- Output : 2.
- Example-2 : Getting quotient 1 when 4 is divided by 4.
- Output : 1.
- Example-3 :
- Output : 0.
What is an AS statement?
The AS statement in SQL is a part of the FROM clause. Also, it is used to assign aliases to columns and tables within the SELECT, WHERE, JOIN, and GROUP BY clauses. It is a placeholder that can define an alias for the object being created.
What is an alias in DB2?
An alias is just that, an alternative name for a field or value. Aliases are assigned with the AS keyword. SQL aliases are used to give a table, or a column in a table, a temporary name. Aliases are often used to make column names more readable. Below is a selection from the “Product” table in the DB2 database.
What DB2 commands can be checked by DB2 authorization?
Db2 commands that are issued from a logged-on z/OS® console or TSO SDSF can be checked by Db2 authorization using primary and secondary authorization IDs.
How do I change the headings of a column in DB2?
When you use the SELECT statement to query data from a table, Db2 use the column names as the headings for the output: However, you can change the column headings by giving them aliases using the following syntax: The AS keyword is optional.
Is this query possible with db2-luw and AS400?
For example, is this query possible: Whenever I attempt this, I am getting the SQL0104 error and it is saying “Token , was not valid. Valid tokens: FROM INTO”. Thank you for your help. EDIT: This query is running inside an SQLRPGLE program on an AS400. Yes it is possible, at least with current versions of Db2-LUW.