Download Beginning Oracle SQL for Oracle Database 12c by Lex deHaan, PDF

By Lex deHaan,

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 device any Oracle developer or database administrator can regularly anticipate, and it's conventional in developing scripts to automate regimen initiatives. SQL Developer is a strong, graphical setting for constructing and debugging queries. Oracles is most likely the main worthwhile dialect of SQL from a profession perspective. Oracles database engine is favourite in company environments all over the world. it's also present in many govt purposes. Oracle SQL implements many good points now not present in competing items. No developer or DBA operating with Oracle can find the money for to be with out wisdom of those beneficial properties and the way they paintings, as a result of the functionality and expressiveness they convey to the desk. Written in an easygoing and example-based variety, starting Oracle SQL is the booklet that may get you begun down the trail to effectively writing SQL statements and getting effects from Oracle Database. Takes an example-based procedure, with transparent and authoritative factors Introduces either SQL and the question instruments used to execute SQL statements indicates how one can create tables, populate them with facts, after which question that information to generate enterprise effects What you’ll research Create database tables and outline their relationships. upload facts for your tables. Then switch and delete that facts. Write database queries that generate exact effects. stay away from universal traps and pitfalls in writing SQL queries, particularly from nulls. attain the functionality and expressiveness of analytic and window features. utilize Oracle Databases aid for item varieties. Write recursive queries to question hierarchical info. Who this ebook is for starting Oracle SQL is aimed toward builders and database directors who needs to write SQL statements to execute opposed to an Oracle database. No earlier wisdom of SQL is believed. desk of Contents 1. Relational Database platforms and Oracle 2. advent to SQL and SQL*Plus, and SQL Developer three. facts Definition, half I four. Retrieval: the fundamentals five. Retrieval: services 6. info Manipulation 7. info Definition, half II eight. Retrieval: Joins and Grouping nine. Retrieval: complicated positive aspects 10. perspectives eleven. Automating 12. Object-Relational positive aspects thirteen. Appendix A – Case Tables 14. Appendix B – workout recommendations

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The counterpart of GRANT is the REVOKE command. Figure 2-4 shows the syntax diagram for REVOKE. Figure 2-4. The REVOKE command syntax diagram Besides the two standard SQL commands mentioned in this section (GRANT and REVOKE), Oracle supports several additional commands in the security and data access area; for example, to influence the locking behavior of the DBMS, to implement auditing, and to set up more detailed user authorization. 2 Basic SQL Concepts and Terminology This section discusses the following topics: • Constants (literals) • Variables • Operators, operands, conditions, and expressions • Functions • Database object names • Comments • Reserved words Constants (Literals) A constant (or literal) is something with a fixed value.

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.

Operands are the “victims” of operations; that is, operands serve as input for operators. Sometimes, operators need only a single operand (in which case, they are also referred to as monadic operators), but most operators need two or more operands. The SQL operators are divided in four categories, where the differentiating factor is the operand datatype: • Arithmetic operators • Alphanumeric operators • Comparison operators • Logical operators Arithmetic Operators The SQL language supports four arithmetic operators, as shown in Table 2-5.

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