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 only software any Oracle developer or database administrator can regularly expect, and it truly is familiar in growing scripts to automate regimen initiatives. SQL Developer is a robust, graphical atmosphere for constructing and debugging queries. Oracle's is very likely the main helpful dialect of SQL from a profession perspective. Oracle's database engine is wide-spread in company environments around the globe. it's also present in many executive functions. Oracle SQL implements many beneficial properties now not present in competing items. No developer or DBA operating with Oracle can come up with the money for to be with out wisdom of those gains and the way they paintings, a result of functionality and expressiveness they convey to the desk.
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Additional info for Beginning Oracle SQL, 3rd Edition: For Oracle Database 12c
See Chapter 7 for details. Reserved Words Just like any other language, SQL has a list of reserved words. These are words you are not allowed to use, for example, as database object names. If you insist on using a reserved word as an object name, you must enclose the name within double quotes, as explained earlier in the “Database Object Naming” section. These are some examples of SQL reserved words: AND, CREATE, DROP, FROM, GRANT, HAVING, INDEX, INSERT, MODIFY, NOT, NULL, NUMBER, OR, ORDER, RENAME, REVOKE, SELECT, SYNONYM, SYSDATE, TABLE, UPDATE, USER, VALUES, VIEW, and WHERE.
For an example of the use of the concatenation operator, see Table 2-8, later in this chapter. Comparison Operators The comparison operators allow you to formulate conditions in SQL. Table 2-6 shows the comparison operators available in SQL. 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.
The other is to add one or more rows to a table based on a selection (and manipulation) of existing data in the database (called a subquery). ■■Note You can also load data into an Oracle database with various tools specifically developed for this purpose—such as Data Pump since Oracle Database 10g, Export and Import in previous Oracle releases, and SQL*Loader. These tools are often used for high-volume data loads. Data manipulation commands are always treated as being part of a transaction. This means (among other things) that all database changes caused by SQL data manipulation commands get a pending status until you confirm (commit) or cancel (roll back) the transaction.