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select last_name from employees where job_id='SA_REP';

Always scan from the original document Just as you lose quality when you make a copy of a copy on a photocopier, so too do you lose quality when scanning from something other than an original file

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If you tried specifying the character literal without the quotes, an Oracle error would be raised Remember that character literal data is case sensitive, so the following WHERE clauses are not equivalent Clause 1: where job_id=SA_REP Clause 2: where job_id='Sa_Rep' Clause 3: where job_id='sa_rep' Clause 1 generates an ORA-00904: SA_REP : invalid identifier error, since the literal SA_REP is not wrapped in single quotes Clause 2 and Clause 3 are syntactically correct but not equivalent Further, neither of these clauses yields any data, since there are no rows in the EMPLOYEES table having JOB_ID column values that are either Sa_Rep or sa_rep Character-based conditions are not limited to comparing column values with literals They may also be specified using other character columns and expressions Character-based expressions may form either one or both parts of a condition separated by a conditional operator These expressions can be formed by concatenating literal values with one or more character columns The following four clauses demonstrate some of the options for character-based conditions: Clause 1: where 'A '||last_name||first_name = 'A King' Clause 2: where first_name||' '||last_name = last_name||' '||first_name Clause 3: where 'SA_REP'||'King' = job_id||last_name Clause 4: where job_id||last_name ='SA_REP'||'King' Clause 1 concatenates the string literal A to the LAST_NAME and FIRST_NAME columns This expression is compared to the literal A King Clause 2 demonstrates that character expressions may be placed on both sides of the conditional operator Clause 3 illustrates that literal expressions may also be placed on the left of the conditional operator It is logically equivalent to clause 4, which has swapped the operands in clause 3 around Both clauses 3 and 4 identically restrict the results

DATE columns are useful for storing date and time information Date literals must be enclosed in single quotation marks just like character data When used in conditional WHERE clauses, date columns may be compared to other date columns, literals, or expressions The literals are automatically converted into DATE values based on the default date format, which is DD-MON-RR If a literal occurs in an expression involving a DATE column, it is automatically converted into a date value using the default format mask DD represents days, MON represents the first three letters of a month, and RR represents a Year 2000 compliant year (that is, if RR is between 50

and 99, then the Oracle server returns the previous century, or else it returns the current century) The full four-digit year, YYYY, can also be specified Consider the following four WHERE clauses: Clause 1: where Clause 2: where Clause 3: where Clause 4: where start_date start_date start_date start_date = = = = end_date; '01-JAN-2001'; '01-JAN-01'; '01-JAN-99';

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