By Lex deHaan, Karen Morton, Tim Gorman, Inger Jorgensen, Daniel Fink
Starting Oracle SQL is your advent to the interactive question instruments and particular dialect of SQL used with Oracle Database. The ebook is a revision of the vintage gaining knowledge of Oracle SQL and SQL*Plus by way of Lex de Haan, and has been up to date to hide advancements in Oracle's model of the SQL question language. Written in an easygoing and example-based type, starting Oracle SQL is the publication that might get you all started down the trail to effectively writing SQL statements and getting effects from Oracle database.
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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 (GGRANT 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: x Constants (literals) x Variables x Operators, operands, conditions, and expressions x Functions x Database object names x Comments x Reserved words Constants (Literals) A constant (or literal) is something with a fixed value.
Ted Codd’s article started a revolution and radically changed the way people think about databases. What makes a DBMS a relational DBMS? In other words: how can we determine how relational a DBMS is? To answer this question, we must visit the theoretical foundation of the relational model. The following two sections discuss two important aspects of the relational model: relational data structures and relational operators. After these two sections, we will address another question: how relational is my DBMS?
Table 2-1. The Six Main Components of the SELECT Command Component Description FROM Which table(s) is (are) needed for retrieval? WHERE What is the condition to filter the rows? GROUP BY How should the rows be grouped/aggregated? HAVING What is the condition to filter the aggregated groups? 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.