Pro Oracle SQL (Expert's Voice in Oracle) by Karen Morton
By Karen Morton
Professional Oracle SQL unlocks the facility of SQL within the Oracle Database—one of the main effective SQL implementations out there this day. To grasp it calls for a three-pronged procedure: examine the language positive aspects, research the aiding positive factors that Oracle offers to aid use the language successfully, and discover ways to imagine and paintings in units. Karen Morton and her staff assist you grasp robust features of Oracle SQL no longer present in competing databases. You’ll research analytic features, the version clause, and complicated grouping syntax—features that will help in growing sturdy queries for reporting and enterprise intelligence purposes. professional Oracle SQL additionally is helping you reduce parsing overhead, learn execution plans, attempt for proper effects, and exert regulate over SQL execution on your database. You’ll research whilst to create indexes, easy methods to make certain that they make a distinction, tips on how to use SQL Profiles to optimize SQL in packaged purposes, and masses extra. You’ll also understand how SQL is optimized for operating in units, and that the main to getting actual effects lies in to ensure that queries ask transparent and exact questions. What’s the bottom-line? professional Oracle SQL is helping you're employed at a very expert point in Oracle dialect of SQL. You’ll grasp the language, the instruments to paintings successfully with the language, and find out how to take into consideration an issue in SQL. seasoned Oracle SQL is helping you upward thrust above the group to supply stellar carrier on your selected occupation. counseled by means of the OakTable community, a bunch of Oracle technologists recognized for his or her rigorous and medical method of Oracle Database functionality Comprehensive—goes past the language with a spotlight on what you want to comprehend to put in writing winning queries and knowledge manipulation statements. What you’ll examine grasp robust SQL positive factors applied in basic terms in Oracle Database learn and interpret SQL execution plans speedy diagnose and connect badly appearing SQL regulate execution plans via tricks, profiles, and plan baselines Optimize queries inside of packaged purposes with no touching the code realize whilst to not waste time on SQL that's acting optimally Who this e-book is for seasoned Oracle SQL is aimed toward builders and database directors who publish SQL for execution by means of an Oracle database. Readers should still already comprehend the fundamental 4 SQL statements, and be able to research deeply approximately Oracle’s particular implementation of the language, together with Oracle-specific positive aspects and syntax. Readers also needs to are looking to know about Oracle Database gains akin to analytic queries, the version clause, and subquery refactoring which are designed to assist builders and database directors exert keep an eye on over their SQL atmosphere and its execution. desk of Contents middle SQL SQL Execution entry and sign up for equipment SQL is set units It’s in regards to the query SQL Execution Plans complicated Grouping Analytic capabilities The version Clause Subquery Factoring Semi-joins and Anti-joins Indexes past the decide upon Transaction Processing checking out and caliber coverage Plan balance and regulate
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This is why using bind variables instead literals in your SQL statements is so important. When you use a bind variable, Oracle will be able to share the statement even as you change the values of the bind variables, as shown in Listing 2-2. Listing 2-2. The Effect of Using Bind Variables on Parsing SQL> variable v_dept number SQL> exec :v_dept := 10 SQL> select * from employees where department_id = :v_dept; EMPLOYEE_ID FIRST_NAME LAST_NAME EMAIL ... --------------- -------------------- ------------------------- ----------- ...
Example 3: Update single column using subquery in WHERE clause to determine which rows to update. Example 4: Update a table using a SELECT statement to define the table and column values. Example 5: Update multiple columns using a subquery. Listing 1-18. UPDATE Statement Examples SQL> -- create a duplicate employees table SQL> create table employees2 as select * from employees ; Table created. SQL> -- add a primary key SQL> alter table employees2 1 add constraint emp2_emp_id_pk primary key (employee_id) ; Table altered.
Orders group by customer_id ; 47 rows created. 2 161 600 162 220 163 510 164 1233 165 2519 166 309 167 48 12 rows selected. 5 170 66816 22 rows selected. 3 13 rows selected. Note the use of the ALL clause following the INSERT keyword. When ALL is specified, the statement will perform unconditional multi-table inserts. This means that each WHEN clause is evaluated for each row returned by the subquery regardless of the outcome of a previous condition. Therefore, you need to be careful about how you specify each condition.