sql if else

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Liah
26 Jan 2017
1IF (Expression 1)
2BEGIN
3   Statement 1;
4END
5
6ELSE IF (Expression 2)
7BEGIN
8   Statement 2;
9END
10..........
11ELSE 
12BEGIN
13   Default Statement;
14END
source
Charlotte
08 Feb 2017
1-- PL/SQL
2BEGIN
3    IF my_val = 1 THEN [...]
4    ELSE [...]
5    END IF;
6END;
7-- In a query (DUAL is for Oracle)
8SELECT CASE WHEN my_col = 1 THEN 'Ok' ELSE 'Ko' END AS my_result
9FROM DUAL;
source
Ambrine
14 Jan 2017
1IF Boolean_expression
2BEGIN
3    -- Statement block executes when the Boolean expression is TRUE
4END
5ELSE
6BEGIN
7    -- Statement block executes when the Boolean expression is FALSE
8END
source
Yasser
16 Jul 2020
1Case Statement basically
2Like IF - THEN - ELSE statement.
3
4The CASE statement goes through conditions
5and returns a value when the
6first condition is met and
7once a condition is true,
8it will stop reading and return the result.
9If no conditions are true,
10it returns the value in the ELSE clause.
11
12If there is no ELSE part and
13no conditions are true, it returns NULL.
14
15FOR EXAMPLE =
16
17CASE
18    WHEN condition1 THEN result1
19    WHEN condition2 THEN result2
20    WHEN conditionN THEN resultN
21    ELSE result
22END 
23
24-- example:
25SELECT 
26	CASE
27      WHEN (1+6 = 6) THEN 'A'
28      WHEN (1+6 = 7) THEN 'B'
29      WHEN (1+6 = 8) THEN 'C'
30      ELSE 'D'
31	END 
32FROM DUAL;
33
34Result would be 'B' since it is the first
35correct answer
source
Grace
06 Oct 2017
1IF 1=1
2	SELECT 1
3ELSE
4	SELECT 0
5-- returns 1
6
7-- Definition
8IF Boolean_expression   
9     { sql_statement | statement_block }   
10[ ELSE   
11     { sql_statement | statement_block } ]
Ismael
30 Jun 2019
1SELECT CASE             
2            WHEN A + B > C AND B + C > A AND A + C > B THEN
3                CASE 
4                    WHEN A = B AND B = C THEN 'Equilateral'
5                    WHEN A = B OR B = C OR A = C THEN 'Isosceles'
6                    ELSE 'Scalene'
7                END
8            ELSE 'Not A Triangle'
9        END
10FROM TRIANGLES;
11
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