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Full Discussion: Grades exercise
Homework and Emergencies Homework & Coursework Questions Grades exercise Post 303015865 by jgt on Saturday 14th of April 2018 08:47:56 PM
Old 04-14-2018
Your logic is correct, you syntax/punctuation is faulty.
Using the case statement:
Somehow I think that the 50-59 mark should be "D" and less than 50 an "F".
The error is in this part "[50-59]". Do the comparison one character at a time rather than a numeric test.
Using if statements:
Spaces in the test statement are important.
What operators are used for numeric tests, and which for alphabetic?
 

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EXECUTE(7)						  PostgreSQL 9.2.7 Documentation						EXECUTE(7)

NAME
EXECUTE - execute a prepared statement SYNOPSIS
EXECUTE name [ ( parameter [, ...] ) ] DESCRIPTION
EXECUTE is used to execute a previously prepared statement. Since prepared statements only exist for the duration of a session, the prepared statement must have been created by a PREPARE statement executed earlier in the current session. If the PREPARE statement that created the statement specified some parameters, a compatible set of parameters must be passed to the EXECUTE statement, or else an error is raised. Note that (unlike functions) prepared statements are not overloaded based on the type or number of their parameters; the name of a prepared statement must be unique within a database session. For more information on the creation and usage of prepared statements, see PREPARE(7). PARAMETERS
name The name of the prepared statement to execute. parameter The actual value of a parameter to the prepared statement. This must be an expression yielding a value that is compatible with the data type of this parameter, as was determined when the prepared statement was created. OUTPUTS
The command tag returned by EXECUTE is that of the prepared statement, and not EXECUTE. EXAMPLES
Examples are given in the EXAMPLES section of the PREPARE(7) documentation. COMPATIBILITY
The SQL standard includes an EXECUTE statement, but it is only for use in embedded SQL. This version of the EXECUTE statement also uses a somewhat different syntax. SEE ALSO
DEALLOCATE(7), PREPARE(7) PostgreSQL 9.2.7 2014-02-17 EXECUTE(7)
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