how to generate barcode in asp net core

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SELECT ORDER_NUM, ORDER_DATE, MFR, PRODUCT, AMOUNT FROM ORDERS WHERE ORDER_DATE BETWEEN '01-OCT-89' AND '31-DEC-89' ORDER_NUM ---------112961 112968 112963 112983 112979 112992 112975 112987 ORDER_DATE ----------17-DEC-89 12-OCT-89 17-DEC-89 27-DEC-89 12-OCT-89 04-NOV-89 12-OCT-89 31-DEC-89 MFR ---REI ACI ACI ACI ACI ACI REI ACI PRODUCT AMOUNT -------- ----------2A44L $31,500.00 41004 $3,978.00 41004 $3,276.00 41004 $702.00 4100Z $15,000.00 41002 $760.00 2A44G $2,100.00 4100Y $27,500.00

Most joins are equijoins. However, it isn t always necessary to use the equal condition in matching rows to be joined. As a word of caution, however, there are more potential performance issues with joins that are not equijoins because indexes are less likely to be used by the DBMS when the conditional operator is other than = . One common use of the not equal (<>) operator in joins is searching for duplicate rows in a table. When joining a table to itself to detect duplicates, you always have to add a join condition to make sure you don t match a row to itself. Here is a query that looks for duplicate movie titles in the MOVIE table. Note the not equal (<>) comparison on the primary key column (MOVIE_ID) to prevent a row from being matched to itself:

Figure 6-8.

The BETWEEN test includes the endpoints of the range, so orders placed on October 1 or December 31 are included in the query results. Here is another example of a range test: Find the orders that fall into various amount ranges.

SELECT ORDER_NUM, AMOUNT FROM ORDERS WHERE AMOUNT BETWEEN 20000.00 AND 29999.99 ORDER_NUM AMOUNT ---------- ----------113036 $22,500.00 112987 $27,500.00 113042 $22,500.00 SELECT ORDER_NUM, AMOUNT FROM ORDERS WHERE AMOUNT BETWEEN 30000.00 AND 39999.99 ORDER_NUM AMOUNT ---------- ----------112961 $31,500.00 113069 $31,350.00 SELECT ORDER_NUM, AMOUNT FROM ORDERS WHERE AMOUNT BETWEEN 40000.00 AND 49999.99 ORDER_NUM AMOUNT ---------- ----------113045 $45,000.00

The negated version of the range test (NOT BETWEEN) checks for values that fall outside the range, as in this example: List salespeople whose sales are not between 80 percent and 120 percent of quota.

SELECT A.MOVIE_ID, B.MOVIE_ID FROM MOVIE A JOIN MOVIE B ON A.MOVIE_ID <> B.MOVIE_ID AND A.MOVIE_TITLE = B.MOVIE_TITLE;

SELECT NAME, SALES, QUOTA FROM SALESREPS WHERE SALES NOT BETWEEN (.8 * QUOTA) AND (1.2 * QUOTA)

6:

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NAME SALES QUOTA -------------- ------------ -----------Mary Jones $392,725.00 $300,000.00 Sue Smith $474,050.00 $350,000.00 Bob Smith $142,594.00 $200,000.00 Nancy Angelli $186,042.00 $300,000.00

The test expression specified in the BETWEEN test can be any valid SQL expression, but in practice, it s usually just a column name, as in the previous examples. The ANSI/ISO standard defines relatively complex rules for the handling of NULL values in the BETWEEN test: I If the test expression produces a NULL value, or if both expressions defining the range produce NULL values, then the BETWEEN test returns a NULL result. I If the expression defining the lower end of the range produces a NULL value, then the BETWEEN test returns FALSE if the test value is greater than the upper bound, and NULL otherwise. I If the expression defining the upper end of the range produces a NULL value, then the BETWEEN test returns FALSE if the test value is less than the lower bound, and NULL otherwise. Before relying on this behavior, it s a good idea to experiment with your DBMS. It s worth noting that the BETWEEN test doesn t really add to the expressive power of SQL, because it can be expressed as two comparison tests. The range test:

A cross join is nothing more than standard syntax for a Cartesian product. As mentioned earlier, sometimes a Cartesian product is desirable, and it must have been those situations that motivated the standards committees to add this syntax to standard SQL. The query that appeared at the very beginning of this chapter (the one that joined the MOVIE and MOVIE_GENRE tables into a Cartesian product) can be written this way as a cross join:

is completely equivalent to:

(A >= B) AND (A < = C)

However, the BETWEEN test is a simpler way to express a search condition when you re thinking of it in terms of a range of values.

The Set Membership Test (IN)

SELECT MOVIE_ID, MOVIE_GENRE_DESCRIPTION AS GENRE, MOVIE_TITLE FROM MOVIE CROSS JOIN MOVIE_GENRE ORDER BY MOVIE_ID;