barcode generator in vb.net code project Returning similar values from the CDS table in Software

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Returning similar values from the CDS table
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Now let s take a look at a few examples of SELECT statements that include a LIKE predicate. Suppose you want to find any CDs that contain the word Christmas in the title. You can create the following SELECT statement to query the CDS table:
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SELECT * FROM CDS WHERE CD_TITLE LIKE ('%Christmas%');
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Your query results will include only one row:
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CD_ID -----99306 CD_TITLE --------------------That Christmas Feeling
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If you had included only one percentage sign, no rows would have been returned. For example, if you eliminated the first percentage sign, your SQL implementation would have interpreted this to mean that the value must begin with the word Christmas, which it does not. The same is true for the other percentage sign. If you had eliminated that, your implementation would have assumed that Christmas must be the last word in the character string. In addition, if no percentage signs were used, no rows would have been returned because no values would have matched Christmas exactly. You can also add the NOT keyword to a LIKE predicate if you want all rows returned except those specified by the predicate. Take, for instance, the last example. If you add the NOT keyword, it will look like the following:
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SELECT * FROM CDS WHERE CD_TITLE NOT LIKE ('%Christmas%');
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SQL: A Beginner s Guide
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This time, your query results include all rows that do not include the word Christmas:
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CD_ID ----99301 99302 99303 99304 99305 99307 CD_TITLE -----------------------------Famous Blue Raincoat Blue Court and Spark Past Light Kojiki Patsy Cline: 12 Greatest Hits
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Notice that the That Christmas Feeling row is now among the missing. You can also combine one LIKE predicate with another LIKE predicate. Suppose, for example, you still want to exclude the Christmas value, but you want to include the Blue value, as shown in the following example:
SELECT FROM WHERE AND * CDS CD_TITLE NOT LIKE ('%Christmas%') CD_TITLE LIKE ('%Blue%');
The WHERE clause in this SELECT statement eliminates any rows that have the word Christmas appearing anywhere in the CD_TITLE value. In addition, the CD_TITLE value must include the word Blue. As a result, only two rows are returned.
CD_ID ----99301 99302 CD_TITLE -------------------Famous Blue Raincoat Blue
But what happens if the CD title includes both words For example, Elvis Presley s Blue Christmas is now available on CD. The AND keyword used to connect the predicates means that both predicates must be true in order for a row to be returned. Even if a Blue Christmas row existed, it would not be included in the query results because the first predicate (the NOT LIKE one) would evaluate to false.
Try This 9-1
Using Predicates in SQL Statements
Before we move on to other predicates, I think it s a good idea to review those predicates that have already been discussed. These include the six types of comparison predicates, the BETWEEN predicate, the NULL predicate, and the LIKE predicate. In this Try This exercise, you will try a number of these predicates through the use of SELECT statements that will include the appropriate WHERE clauses. You will be querying tables that you created in the INVENTORY database. Because you will be using only SELECT statements, you won t be modifying the tables or the database structure in any way. You ll simply request data based on the predicates that you define. You can download the Try_This_09.txt file, which contains the SQL statements used in this exercise.
9:
Using Predicates
Step by Step
1. Open the client application for your RDBMS and connect to the INVENTORY database. 2. In the first statement you create, you ll query the MUSIC_TYPES table to return the names
of those rows whose TYPE_ID value is equal to 11 or 12. Enter and execute the following SQL statement:
SELECT FROM WHERE OR TYPE_ID, TYPE_NAME MUSIC_TYPES TYPE_ID = 11 TYPE_ID = 12;
The statement should return two rows, one for Blues and one for Jazz. Notice that the OR keyword is used to indicate that either value is acceptable.
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