Can we use count with GROUP BY?
The GROUP BY statement is often used with aggregate functions ( COUNT() , MAX() , MIN() , SUM() , AVG() ) to group the result-set by one or more columns.
What is the use of SELECT count in SAP ABAP?
COUNT( DISTINCT col ) Determines the number of different values in the column col in the resulting set or in the current group. COUNT( * ) (or COUNT(*)) Determines the number of rows in the resulting set or in the current group. No column label is specified in this case.
What is GROUP BY in SELECT statement in SAP ABAP?
If GROUP BY is used, the statement SELECT bypasses table buffering. Using GROUP BY and aggregate functions ensures that aggregates and groups are assembled by the database system, not AS ABAP. This can considerably reduce the volume of data that has to be transported from the database to AS ABAP.
Can we use aggregate function in where clause in SAP ABAP?
Aggregate functions, such as sum() and min() are allowed only in the select list and in the HAVING clause of a SELECT statement. Aggregate functions cannot be specified in the GROUP BY, GROUP ORDER BY, GROUP FILTER, and WHERE clauses of the SELECT statement.
Can I use count without GROUP BY?
Using COUNT, without GROUP BY clause will return a total count of a number of rows present in the table. Adding GROUP BY, we can COUNT total occurrences for each unique value present in the column. we can use the following command to create a database called geeks.
Can we use GROUP BY without aggregate function?
GROUP BY without Aggregate Functions
Although most of the times GROUP BY is used along with aggregate functions, it can still still used without aggregate functions — to find unique records.
What does SELECT count (*) from table do?
The COUNT (*) function returns the number of rows that satisfy the WHERE clause of a SELECT statement.
How do I count the number of rows in a table in ABAP?
The functional module EM_GET_NUMBER_OF_ENTRIES will also provide the row count. It takes 1 parameter – the table name. This function modules allows you to read the number of rows in a database table. The question was about the rows of an internal table.
What is the difference between GROUP BY and having?
While the GROUP BY Clause groups rows that have the same values into summary rows. The having clause is used with the where clause in order to find rows with certain conditions. The having clause is always used after the group By clause.
What is the use of GROUP BY clause?
The GROUP BY Clause is utilized in SQL with the SELECT statement to organize similar data into groups. It combines the multiple records in single or more columns using some functions.
Can we create nested views in SAP ABAP Dictionary views?
In CDS you can define CDS views that are based on one or more CDS views. This is called as “View-on-View” or some times referred as “Nested Views“. In nested views, a join of CDS views and join of CDS view with database table is supported. There is not technical limitation for nesting depth and complexity of CDS views.
How do you sum in SELECT query in SAP ABAP?
We would like to sum of the value of both rows in the select statement. DATA: C1 TYPE i, C2 TYPE i, total type i. SELECT SUM( field1 ) SUM( fiedl2 ) into ( c1 c2 )from tablename. total = c1 + c2.
Can GROUP BY be used in subquery?
You can use group by in a subquery, but your syntax is off.
Can you GROUP BY without aggregate?
You can use the GROUP BY clause without applying an aggregate function.
Is GROUP BY faster than distinct?
DISTINCT is used to filter unique records out of all records in the table. It removes the duplicate rows. SELECT DISTINCT will always be the same, or faster than a GROUP BY.
Which one is faster COUNT (*) or COUNT 1?
The simple answer is no – there is no difference at all. The COUNT(*) function counts the total rows in the table, including the NULL values.
What is the output of select COUNT (*)?
The count function returns the number of rows in the specified dataset. If you don’t specify a table to select from, a single select will only ever return a single row – therefore count(*) will return 1.
How do I count rows in SAP?
You can use the LINES function to get the number of rows in an internal table. Use the following syntax to call the function: DESCRIBE TABLE <Internal Table Name> LINES <Variable Name> Once the function is executed the variable will hold the number of rows in the internal table.
How do I find the number of entries in a table in SAP?
In SAP level, you can use transaction code SE16 or SE16N to get the same output which is much easier. So, just execute transaction code SE16N. Example, for table USR02. Click on Number of Entries and you will get the numbers!
Which is faster joins or subqueries?
The advantage of a join includes that it executes faster. The retrieval time of the query using joins almost always will be faster than that of a subquery. By using joins, you can maximize the calculation burden on the database i.e., instead of multiple queries using one join query.
Can I use HAVING Without GROUP BY?
Having can be used without groupby clause,in aggregate function,in that case it behaves like where clause. groupby can be used without having clause with the select statement.
Can we use * in GROUP BY clause?
You can, but the “GROUP BY” clause is used for grouping together sets of rows, so it does not make sense for your question (or anything that involves a “SELECT *”).
Can we use two GROUP BY in same query?
Yes, it is possible to use MySQL GROUP BY clause with multiple columns just as we can use MySQL DISTINCT clause. Consider the following example in which we have used DISTINCT clause in first query and GROUP BY clause in the second query, on ‘fname’ and ‘Lname’ columns of the table named ‘testing’.
What is the difference between SE11 view and CDS view?
SQL-Fetched Data Gets Processed at the Database Level
In the case of ABAP CDS views, the views reside at the application level in the Data Dictionary (SE11), but a CDS view can pass more logic than an ABAP dictionary view from the application server to the database through SQL.
What is difference between CDS and AMDP?
CDS VS AMDP :
CDS views can be created to read and process data at DB layer. Whereas AMDP can be created to process and modify data at DB layer. AMDP is used to work with stored procedures, which further go to HANA DB layer and execute that. This functionality can’t be achieved by Open SQL and CDS.