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DECLARE var NUMBER; BEGIN /* N.B. for loop variables in PL/SQL are new declarations, with scope only inside the loop */ FOR var IN 0.. 10 LOOP DBMS_OUTPUT. PUT_LINE (var); END LOOP; IF var IS NULL THEN DBMS_OUTPUT. PUT_LINE ('var is null'); ELSE DBMS_OUTPUT. PUT_LINE ('var is not null'); END IF; END;
The detailed semantics of "the" ternary operator as well as its syntax differs significantly from language to language. A top level distinction from one language to another is whether the expressions permit side effects (as in most procedural languages) and whether the language provides short-circuit evaluation semantics, whereby only the selected expression is evaluated (most standard ...
where the Oracle user scott has the password tiger. SQL Plus then presents a prompt with the default form of: SQL> Interactive use can then start by entering a SQL statement (terminated by a semicolon), a PL/SQL block, or another command. For example:
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Block comment in Ruby opens at =begin line and closes at =end line. S-Lang. The region of lines enclosed by the #<tag> and #</tag> delimiters are ignored by the interpreter. The tag name can be any sequence of alphanumeric characters that may be used to indicate how the enclosed block is to be deciphered.
If-then-else flow diagram A nested if–then–else flow diagram. In computer science, conditionals (that is, conditional statements, conditional expressions and conditional constructs) are programming language constructs that perform different computations or actions or return different values depending on the value of a Boolean expression, called a condition.
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if a then { if b then s1 } else s2 if a then { if b then s1 else s2 } The dangling-else problem dates back to ALGOL 60 , [ 1 ] and subsequent languages have resolved it in various ways. In LR parsers , the dangling else is the archetypal example of a shift-reduce conflict .