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 comprise SQL*Plus and SQL Developer. SQL*Plus is the only instrument any Oracle developer or database administrator can constantly expect, and it really is time-honored in growing scripts to automate regimen projects. SQL Developer is a strong, graphical surroundings for constructing and debugging queries. Oracles is most likely the main precious dialect of SQL from a profession perspective. Oracles database engine is well-known in company environments around the globe. it's also present in many govt functions. Oracle SQL implements many positive aspects now not present in competing items. No developer or DBA operating with Oracle can have enough money to be with no wisdom of those beneficial properties and the way they paintings, end result of the functionality and expressiveness they convey to the desk. Written in an easygoing and example-based kind, starting Oracle SQL is the e-book that might get you began down the trail to effectively writing SQL statements and getting effects from Oracle Database. Takes an example-based procedure, with transparent and authoritative causes Introduces either SQL and the question instruments used to execute SQL statements indicates the best way to create tables, populate them with facts, after which question that facts to generate enterprise effects What you’ll research Create database tables and outline their relationships. upload facts for your tables. Then swap 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. obtain the functionality and expressiveness of analytic and window services. utilize Oracle Databases help for item forms. Write recursive queries to question hierarchical info. Who this ebook is for starting Oracle SQL is geared toward builders and database directors who needs to write SQL statements to execute opposed to an Oracle database. No previous wisdom of SQL is thought. desk of Contents 1. Relational Database structures and Oracle 2. creation to SQL and SQL*Plus, and SQL Developer three. information Definition, half I four. Retrieval: the fundamentals five. Retrieval: features 6. info Manipulation 7. facts Definition, half II eight. Retrieval: Joins and Grouping nine. Retrieval: complex good points 10. perspectives eleven. Automating 12. Object-Relational gains thirteen. Appendix A – Case Tables 14. Appendix B – workout ideas
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In general, to enhance the readability of your SQL code, it is highly recommended that you restrict yourself to using the characters A through Z, the digits 0 through 9, and optionally the underscore (_). ■■Note In Oracle, object names are case-insensitive; that is, internally all database object names are converted to uppercase, regardless of how you enter those names. You may use digits in database object names; however, database object names should always start with a letter. Oracle object names have a maximum length of 30 characters.
With the ALTER SESSION SET CURRENT_SCHEMA command, you can “visit” a different schema in SQL*Plus without changing your identity as database user, and therefore without changing any of your privileges.
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. Logical Operators SQL also offers three operators whose operands are conditions: the logical (or Boolean) operators.