key word that contains digits or starts or ends with an underscore, so identifiers of this form are safe against possible conflict with future extensions of the standard. The system uses no more than NAMEDATALEN-1 trying to avoid division by zero in a WHERE clause: SELECT ... WHERE x > 0 AND y/x > 1.5; But this is safe: SELECT ... WHERE CASE WHEN x > 0 THEN y/x > 1.5 ELSE false END; A CASE construct used in this fashion 'mallory'; UPDATE information SET info = 'secret from mallory' WHERE group_id = 2; COMMIT; That looks safe; there is no window wherein mallory should be able to see the “secret from mallory” string. However

key word that contains digits or starts or ends with an underscore, so identifiers of this form are safe against possible conflict with future extensions of the standard. 32 SQL Syntax The system uses trying to avoid division by zero in a WHERE clause: SELECT ... WHERE x > 0 AND y/x > 1.5; But this is safe: SELECT ... WHERE CASE WHEN x > 0 THEN y/x > 1.5 ELSE false END; A CASE construct used in this fashion 'mallory'; UPDATE information SET info = 'secret from mallory' WHERE group_id = 2; COMMIT; That looks safe; there is no window wherein mallory should be able to see the “secret from mallory” string. However

key word that contains digits or starts or ends with an underscore, so identifiers of this form are safe against possible conflict with future extensions of the standard. The system uses no more than NAMEDATALEN-1 trying to avoid division by zero in a WHERE clause: SELECT ... WHERE x > 0 AND y/x > 1.5; But this is safe: SELECT ... WHERE CASE WHEN x > 0 THEN y/x > 1.5 ELSE false END; A CASE construct used in this fashion NATURAL JOIN behaves like JOIN ... ON TRUE, producing a cross-product join. Note: USING is reasonably safe from column changes in the joined relations since only the listed columns are combined. NATURAL is

key word that contains digits or starts or ends with an underscore, so identifiers of this form are safe against possible conflict with future extensions of the standard. 33 SQL Syntax The system uses division by zero in a WHERE clause: 54 SQL Syntax SELECT ... WHERE x > 0 AND y/x > 1.5; But this is safe: SELECT ... WHERE CASE WHEN x > 0 THEN y/x > 1.5 ELSE false END; A CASE construct used in this fashion 'mallory'; UPDATE information SET info = 'secret from mallory' WHERE group_id = 2; COMMIT; That looks safe; there is no window wherein mallory should be able to see the “secret from mallory” string. However

key word that contains digits or starts or ends with an underscore, so identifiers of this form are safe against possible conflict with future extensions of the standard. The system uses no more than NAMEDATALEN-1 trying to avoid division by zero in a WHERE clause: SELECT ... WHERE x > 0 AND y/x > 1.5; But this is safe: SELECT ... WHERE CASE WHEN x > 0 THEN y/x > 1.5 ELSE false END; A CASE construct used in this fashion NATURAL JOIN behaves like JOIN ... ON TRUE, producing a cross-product join. Note: USING is reasonably safe from column changes in the joined relations since only the listed columns are combined. NATURAL is

key word that contains digits or starts or ends with an underscore, so identifiers of this form are safe against possible conflict with future extensions of the standard. 33 SQL Syntax The system uses trying to avoid division by zero in a WHERE clause: SELECT ... WHERE x > 0 AND y/x > 1.5; But this is safe: SELECT ... WHERE CASE WHEN x > 0 THEN y/x > 1.5 ELSE false END; A CASE construct used in this fashion 'mallory'; UPDATE information SET info = 'secret from mallory' WHERE group_id = 2; COMMIT; That looks safe; there is no window wherein mallory should be able to see the “secret from mallory” string. However

key word that contains digits or starts or ends with an underscore, so identifiers of this form are safe against possible conflict with future extensions of the standard. The system uses no more than NAMEDATALEN-1 trying to avoid division by zero in a WHERE clause: SELECT ... WHERE x > 0 AND y/x > 1.5; But this is safe: SELECT ... WHERE CASE WHEN x > 0 THEN y/x > 1.5 ELSE false END; A CASE construct used in this fashion 'mallory'; UPDATE information SET info = 'secret from mallory' WHERE group_id = 2; COMMIT; That looks safe; there is no window wherein mallory should be able to see the “secret from mallory” string. However

key word that contains digits or starts or ends with an underscore, so identifiers of this form are safe against possible conflict with future extensions of the standard. The system uses no more than NAMEDATALEN-1 trying to avoid division by zero in a WHERE clause: SELECT ... WHERE x > 0 AND y/x > 1.5; But this is safe: SELECT ... WHERE CASE WHEN x > 0 THEN y/x > 1.5 ELSE false END; A CASE construct used in this fashion 'mallory'; UPDATE information SET info = 'secret from mallory' WHERE group_id = 2; COMMIT; That looks safe; there is no window wherein mallory should be able to see the “secret from mallory” string. However

key word that contains digits or starts or ends with an underscore, so identifiers of this form are safe against possible conflict with future extensions of the standard. The system uses no more than NAMEDATALEN-1 trying to avoid division by zero in a WHERE clause: SELECT ... WHERE x > 0 AND y/x > 1.5; But this is safe: SELECT ... WHERE CASE WHEN x > 0 THEN y/x > 1.5 ELSE false END; 42 Chapter 4. SQL Syntax A CASE that it checks the input values for well-formedness, and there are support functions to perform type-safe operations on it; see Section 9.14. Use of this data type requires the installation to have been built

key word that contains digits or starts or ends with an underscore, so identifiers of this form are safe against possible conflict with future extensions of the standard. The system uses no more than NAMEDATALEN-1 trying to avoid division by zero in a WHERE clause: SELECT ... WHERE x > 0 AND y/x > 1.5; But this is safe: SELECT ... WHERE CASE WHEN x > 0 THEN y/x > 1.5 ELSE false END; 46 Chapter 4. SQL Syntax A CASE that it checks the input values for well-formedness, and there are support functions to perform type-safe operations on it; see Section 9.14. Use of this data type requires the installation to have been built