By Lex deHaan, Tim Gorman, Inger Jorgensen, Melanie Caffrey

Starting Oracle SQL is your creation to the interactive question instruments and particular dialect of SQL used with Oracle Database. those instruments contain SQL*Plus and SQL Developer. SQL*Plus is the single instrument any Oracle developer or database administrator can regularly expect, and it's well-known in developing scripts to automate regimen initiatives. SQL Developer is a robust, graphical surroundings for constructing and debugging queries. Oracle's is probably the main precious dialect of SQL from a profession perspective. Oracle's database engine is commonly used in company environments all over the world. it's also present in many govt purposes. Oracle SQL implements many beneficial properties now not present in competing items. No developer or DBA operating with Oracle can manage to pay for to be with no wisdom of those positive aspects and the way they paintings, as a result functionality and expressiveness they create to the desk.

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Additional resources for Beginning Oracle SQL, 3rd Edition: For Oracle Database 12c

Example text

The output will be displayed in the Script Output window alongside the Query Result window. Notice that the output is almost identical to what you would see in SQL*Plus and is displayed below in Figure 2-15. Figure 2-15. Querying EMPLOYEES and DEPARTMENTS tables When running scripts, the output is appended to the Script Output window. To clear the window so that only new output is displayed, click on the Clear button (the picture of the pencil eraser). ■■Note Not all supported SQL*Plus output formatting commands are properly interpreted for Run Script.

Table 2-6. = Not equal to Expressions with comparison operators are also referred to as predicates or Boolean expressions. These expressions evaluate to TRUE or FALSE. Sometimes, the outcome is UNKNOWN, such as when you have rows with missing information. We will revisit this topic in more detail in Chapter 4, when we discuss null values. Logical Operators SQL also offers three operators whose operands are conditions: the logical (or Boolean) operators. Table 2-7 lists these operators. info Chapter 2 ■ Introduction to SQL and SQL Developer Table 2-7.

Notice that the output is almost identical to what you would see in SQL*Plus and is displayed below in Figure 2-15. Figure 2-15. Querying EMPLOYEES and DEPARTMENTS tables When running scripts, the output is appended to the Script Output window. To clear the window so that only new output is displayed, click on the Clear button (the picture of the pencil eraser). ■■Note Not all supported SQL*Plus output formatting commands are properly interpreted for Run Script. For example, the COLUMN command does not change the column headings, but SET FEEDBACK OFF works as expected.

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Beginning Oracle SQL, 3rd Edition: For Oracle Database 12c by Lex deHaan, Tim Gorman, Inger Jorgensen, Melanie Caffrey
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