By Lex deHaan
I've been doing a survey of Oracle books for the reason that i've got a necessity to benefit this database.. I took this e-book out of the library and that i used to be a few of their samples that seem like they've been thrown available in the market waiting for you to get the information at the back of them. I went on-line to Apress trying to find the resource code and downloaded it basically to discover that the information is lacking from the tables (actually all of the code contained easy decide upon statements).
If you're studying SQL, and they're featuring how you can you services, they need to give you the info as a obtain, integrated CD or another structure. another way, the reader could have no clue in the back of what they try to teach you...
For instance, in bankruptcy four they're displaying the variation among utilizing the decide on assertion with and with no the detailed characteristic. in accordance with their dialogue their are eight rows displayed rather than 14 other than what's the unique info entered into the desk? Am I lacking something?
The purely strong booklet that i discovered is Oracle Database by means of Jason rate. although he specializes in a few small stuff he's coherent, entire and thorough in his presentation. furthermore the total resource code may be downloaded from the internet. the one factor is that he stuffs many of the examples right into a few records yet you could simply minimize the knowledge out that you simply desire (at least the desk information is supplied to the person which fairly helps)...
This earlier week, I went to the Apress site and stuffed out an errata in this book... even if, they stated the author should be contacted, i don't imagine something will turn up altering this factor (even even though i don't think it's a significant fix).
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Additional resources for Mastering Oracle SQL and SQL*Plus
Consult the Oracle documentation for more information about configuring and troubleshooting iSQL*Plus. In Chapter 11, we will discuss some more advanced features of the iSQL*Plus URL address field; for the time being, you now know enough to get started. At this point, to follow along with the discussion, you need the BOOK schema with the seven case tables created in your database. com) for guidelines on how to do this. The iSQL*Plus Login screen looks like Figure 2-5.
Table 2-7 lists these operators. Table 2-7. SQL Logical Operators Operator Description AND Logical AND OR Logical OR (the inclusive OR) NOT Logical negation Expressions An expression is a well-formed string containing variables, constants, operators, or functions. Just like constants, expressions always have a certain datatype. See Table 2-8 for some examples of expressions. Table 2-8. SQL Expression Examples Expression Datatype 3 + 4 Numeric ENAME || ', ' || INIT Alphanumeric LOCATION = 'Utrecht' Boolean 12*MSAL > 20000 AND COMM >= 100 Boolean BDATE + INTERVAL '16' YEAR Date 999 Numeric CHAPTER 2 ■ INTRODUCTION TO SQL, i SQL*PLUS, AND SQL*PLUS The last example in Table 2-8 shows that the simplest expression is just a constant.
SELECT Which columns do you want to see in the result? ORDER BY In which order do you want to see the resulting rows? ■Tip The order of the SELECT command components as displayed in Table 2-1 is also a good order to think about them when writing SQL statements. Notice that the SELECT clause is almost the last one. 6) as follows: CHAPTER 2 ■ INTRODUCTION TO SQL, i SQL*PLUS, AND SQL*PLUS • The SELECT component acts as the projection operator. • The FROM component implements the join operator. • The restriction operator corresponds to the WHERE component.