ABAP CDS - Language Elements

The following sections summarize the language elements of the DDL and DCL of the ABAP CDS, arranged by topics.
•DDL
◦CDS Views
◦CDS View Enhancements
•DCL
◦CDS Roles
◦CDS Access Policies

In addition to the language elements show here, CDS source code can also contain annotations for metadata. 

 DDL 

 CDS Views 

 Keywords and Additions 

Language Element Meaning
DEFINE VIEW ... AS Defines a CDS view
WITH PARAMETERS Defines input parameters of a CDS view
SELECT [DISTINCT] ... FROM SELECT statement of a CDS view
INNER JOIN ... ON Inner join in a SELECT statement
LEFT|RIGHT OUTER JOIN ... ON Outer join in a SELECT statement
ASSOCIATION ... TO ... AS ... ON Defines an association for a path expression in a SELECT statement
1: Attribute of a path expression
INNER ... WHERE Attribute of a path expression
LEFT OUTER ... WHERE Attribute of a path expression
KEY ... AS Element of a SELECT list
$EXTENSION.* Elements of an enhancement in a SELECT list
WHERE ... WHERE clause of a SELECT statement
GROUP BY ... GROUP-BY clause of a SELECT statement
HAVING ... HAVING clause of a SELECT statement
UNION ALL ... UNION clause of a SELECT statement 

 Expressions 

Operators Meaning
MAX, MIN, AVG, SUM, COUNT Aggregate expressions in a SELECT statement
+, -, *, / Arithmetic expressions in a SELECT statement
CASE, WHEN, THEN, ELSE, END Case distinctions in a SELECT statement
CAST Casting expression in a SELECT statement
=, <>, <, >, <=, >=, BETWEEN, LIKE, IS NULL, NOT, AND, OR Relational expressions in a SELECT statement 

 Predefined Functions 

Function Meaning
ABS, CEIL, DIV, DIVISION, FLOOR, MOD, ROUND Numeric functions in a SELECT statement
CONCAT, LPAD, REPLACE, SUBSTRING String functions in a SELECT statement
COALESCE Coalesce function in a SELECT statement
CURRENCY_CONVERSION, UNIT_CONVERSION, DECIMAL_SHIFT Conversion functions in a SELECT statement 

 CDS View Enhancements 

 Keywords and Additions 

Language Element Meaning
EXTEND VIEW ... WITH Enhancement of a CDS view with an CDS view enhancement 

 DCL 

 CDS Roles 

 Keywords and Additions 

Language Element Meaning
DEFINE ROLE ... GRANT SELECT ON Defines a CDS role
WHERE, AND, OR WHERE clause in the definition of a CDS role
... = ASPECT pfcg_auth ... Condition for mapping roles
... =|<>|<|>|<=|>=|LIKE|IS NULL ASPECT ... Condition for assignment roles
... =|<>|<|>|<=|>=|LIKE|IS NULL ... Literal condition 

 CDS Access Policies 

 Keywords and Additions 

Language Element Meaning
DEFINE ACCESSPOLICY Defines a CDS access policy
DEFINE ASPECT ... AS Defines a CDS aspect
SELECT FROM SELECT statement of an CDS aspect
WHERE $user IN WHERE clause of the SELECT statement of an CDS aspect