What is the use of VALUE function in Db2?
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What is the use of VALUE function in Db2?
The VALUE function returns the value of the first non-null expression. The schema is SYSIBM. The VALUE function is identical to the COALESCE function. COALESCE should be used for conformance to SQL standard.
What is the use of coalesce in Db2?
The COALESCE function returns the first non-null expression in a list of expressions. The schema is SYSIBM. An expression that returns a value of any built-in or user-defined data type. An expression that returns a value of any built-in or user-defined data type and that is compatible with the data type of expression1.
How do you handle a null in Db2 query?
To test for the existence of nulls, use the special predicate IS NULL in the WHERE clause of the SELECT statement. You cannot simply state WHERE column = NULL. You must state WHERE column IS NULL. It is invalid to test if a column is <> NULL, or >= NULL.
How do I select a value in SQL?
The SQL SELECT Statement
- SELECT column1, column2, FROM table_name;
- SELECT * FROM table_name;
- Example. SELECT CustomerName, City FROM Customers;
- Example. SELECT * FROM Customers;
What is column function in DB2?
The DB2 COLUMN functions are also known as aggregate functions. These functions take the values from a particular column of multiple rows and return a single value. Below is the list of some most commonly used COLUMN functions. COLUMN FUNCTION.
What is SQL value?
In SQL Server, VALUES is a table value constructor that specifies a set of row value expressions to be constructed into a table. The VALUES clause is often used with INSERT statements to insert data, but it can also be used as a derived table in either the USING clause of the MERGE statement or the FROM clause.
How do I select a value from a column in SQL?
What are aggregate functions in Db2?
An aggregate function receives a set of values for each argument (such as the values of a column) and returns a single-value result for the set of input values. Certain rules apply to all aggregate functions.
What are scalar functions in Db2?
Scalar functions are applied to a column or expression and operate on a single value. Contrast this with the column functions, which are applied to a set of data and return only a single result. There are more than 110 scalar functions, each of which can be applied to a column value or expression.
