What is Max decode?
This tutorial shows how to collect values from multiple rows into a single, comma delimited string. This is also known as “string aggregation”.
What is decode in SQL query?
What is DECODE function in SQL? In Oracle, DECODE function allows us to add procedural if-then-else logic to the query. DECODE compares the expression to each search value one by one. If expression is equal to a search, then the corresponding result is returned by the Oracle Database.
What is the use of Decode in SQL?
The DECODE function returns a value that is the same datatype as the first result in the list. If the first result is NULL, then the return value is converted to VARCHAR2. If the first result has a datatype of CHAR, then the return value is converted to VARCHAR2. If no matches are found, the default value is returned.
What is case and decode in SQL?
CASE is a statement while DECODE is a function. CASE can work with logical operators other than ‘=’ : DECODE performs an equality check only. CASE is capable of other logical comparisons such as < ,> ,BETWEEN , LIKE etc.
Can we use decode inside decode?
It is possible to use DECODE, but you’d have to use nested DECODEs and you’d end up with something that’s much harder to read, understand and therefore maintain.
Can we use null in Decode Oracle?
DECODE. The DECODE function is not specifically for handling null values, but it can be used in a similar way to the NVL function, as shown by the following example.
Can we use decode in PL SQL block?
Since we can’t use decode directly in pl/sql, the plan is to use ‘select decode() into variable from dual’.
Which is an example of the max function in SQL?
SQL MAX with HAVING example We use the MAX function in the HAVING clause to add the condition to the groups that summarized by the GROUP BY clause. For example, to get the department that has employee whose highest salary is greater than 12000, you use the MAX function in the HAVING clause as follows:
How to decode 1 to equal in SQL?
SELECT DECODE ( 1, 1, ‘Equal’ ); Code language: SQL (Structured Query Language) (sql) In this example, the DECODE () function compares the first argument (one) with the second argument (also one). Because the first argument equals the second one, the function returns the third argument which is the string Equal.
How does The DECODE ( ) function in SQL work?
The DECODE () function returned the column to sort based on the input argument. In this case, the DECODE () function returned the salary column, therefore, the result set was sorted by salary column. In this tutorial, you have learned how to use the SQL DECODE () function to add the if-then-else logic to a query.
When to use decode and Max in Python?
In this solution, which uses the DECODE and MAX functions, we assume the total number of values ever collected will not exceed 6. To control the order of the delimited values, change the ORDER BY clause in the ROW_NUMBER () argument.