Download Oracle SQL Recipes: A Problem-Solution Approach by Grant Allen PDF
By Grant Allen
Have you ever been confronted with a brand new kind of question to put in writing, or been requested to create an unusual database item? In such occasions, you will have most likely sought after a very good, good instance upon which to construct, and as a substitute were compelled into the drudgery of parsing railroad-style syntax diagrams in Oracle's guide set. This e-book frees you from that drudgery by means of offering established and dealing examples of SQL used to resolve universal difficulties confronted by way of builders and database directors every day. when you are stressed to get effects quick, Oracle SQL Recipes is there at your side.
- Example-based, delivering caliber ideas to daily difficulties
- Respects a while by way of placing suggestions first and holding discussions brief
- Solves the main in general encountered SQL difficulties
Read or Download Oracle SQL Recipes: A Problem-Solution Approach PDF
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Extra resources for Oracle SQL Recipes: A Problem-Solution Approach
You can count anything you can represent in a result. This means you can count derived data, inferred data, and transient calculations and determinations. Our recipe uses nested subselects and counts at two levels, and is best understood starting from the inside and working out. JOB_HISTORY table. JOB_HISTORY. JOB_HISTORY, building a basic result set that repeats an EMPLOYEE_ID for every position an employee has held. Partial results of just the inner UNION ALL statement are shown here to help you follow the logic.
Solution SQL provides the HAVING clause to apply criteria to grouped data. EMPLOYEES table. Importantly, we only want to see these aggregate values where more than one person performs the same job in a given department. The next SQL statement uses an expression in the HAVING clause to solve our problem. employees group by department_id, job_id having count(*) > 1; Our recipe results in the following summary. 66667 8200 6 SA_MAN 10500 12200 14000 5 SH_CLERK 2500 3215 4200 20 IT_PROG 4200 5760 9000 5 PU_CLERK 2500 2780 3100 5 FI_ACCOUNT 6900 7920 9000 5 9 rows selected.
It then changes each field based on the SET criteria given. It performs this action in one pass of the row. Oracle also supports the grouping the columns and values for updates in parenthesis, in a similar fashion to other databases, but with one quirk. 5 from dual) where employee_id = 131; ■ Note If the subquery returns no data, the values specified in the set clause will be set to null. Note that the value group has to be specified as a well-formed SELECT—other databases would let you get away in this instance with the shortened form like this.