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A CASE expression returns a single value that is conditionally evaluated for each row of a table (or view). Use the WHEN-THEN clauses when you want to execute a CASE expression for some but not all of the rows in the table that is being queried or created.
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17 sty 2022 · We can use the CASE statement in SAS to create a new variable that uses case-when logic to determine the values to assign to the new variable. This statement uses the following basic syntax: proc sql; select var1, case when var2 = 'A' then 'North' when var2 = 'B' then 'South' when var2 = 'C' then 'East' else 'West' end as variable_name
17 cze 2024 · The CASE expression selects values if certain conditions are met. A CASE expression returns a single value that is conditionally evaluated for each row of a table (or view).
The CASE expression in SQL ...
PROC SQL allows a subquery (contained in parentheses) at any point in an expression where a simple column value or constant can be used. In this case, a subquery must return a single value , that is, one row with only one column.
The SQL® procedure supports conditionally selecting result values from rows in a table (or view) in the form of a case expression. Similar to an IF-THEN construct in the DATA step, a case expression uses one or more WHEN-THEN clause(s) to conditionally process some but not all the rows in a table.
8 sie 2024 · CASE expression in the PROC SQL step conditionally selects rows that meet specified conditions. proc sql; select Name, case when Continent = 'North America' then 'Group A' else 'Need to assign' end as Region from states; run; quit;
