The data can be loaded from any text file and inserted into the database. if you have nothing to "start with", no way to describe what to "start with" - how can I figure out "what to start with", In 10gR2 - I reproduce your findings (10.2.0.4). umm, connect by and start with most certainly DO WORK with 11g. Now, this is very useful. The expressions in the syntax represents columns of the table. All rights reserved. And of course, keep up to date with AskTOM via the official twitter account. Especially since you have to check a box saying you agreed. tell you what Ananth, give it what we call the "old college try" using the link I provided first. Select keyword in oracle is applied for fetching a set of data, which can be used singly or by combining other conditional statements as filters. TRIM([ { { LEADING | TRAILING | BOTH }[ trim_character ] | trim_character } FROM ] trim_source). Is it possible to only show certain hierarchies that match a WHERE condition? You can also catch regular content via Connor's blog and Chris's blog. The Oracle NOT condition can also be combined with the LIKE condition. Filters are a good choice when you want to temporarily limit the query results without going into Design View to edit your query. this can be done, but what you have to do first is provide. I went through the Oracle documentation and was very confusing. We are going to see an example of how we can use the having clause with a select statement. create table emp (emp_Id number, mgr_Id number); create table parent( rowid number(2) primary key, id varchar2(14) ); do you have to live with this "structure"? If you specify match_parameter values that conflict, the REGEXP_LIKE condition will use the last value to break the conflict. It is used generally in conjugation with aggregate functions. You should be able to - they are virtually identical in nature. After you run a query, you can further limit the number of items shown in the datasheet by applying filters. The syntax for IF-THEN-ELSIF-ELSE in Oracle/PLSQL is: You use the IF-THEN-ELSIF-ELSE syntax, when you want to execute one set of statements when condition1 is TRUE, a different set of statements when condition2 is TRUE, or a different set of statements when all previous conditions (ie: condition1 and condition2) are FALSE. DECODE(): Facilitates conditional inquiries by doing the work of a CASE or IF-THEN-ELSE statement. SELECT COUNT(EMPLOYEE_ID),VEHICLE_NAME FROM employee GROUP BY VEHICLE_NAME; So in the above example basically we are finding the number of employees using a particular brand of car. These terms are shown in uppercase to distinguish them from terms you define. do you understand how this works (if not, please get there before going further). This is a re-created test case based on a real problem I have with a table that's 17 million rows it is a "dummy no-op" pass, it is an artifact of the explain plan output. Computes the rank of a value in a group of values. ugh. Statistics for all tables is gathered and actual. (in 10g with NOCYCLE and isleaf and other new functions -- they will work much much better with graphs). It is practically not possible to use OR statement in CASE statement as the structure of the CASE statement is very different. If expr1 is null, then NVL2 returns expr3. SQL Server Performance Tuning Practical Workshop is my MOST popular training with no PowerPoint presentations and 100% practical demonstrations. All filters are automatically cleared when you close the query. Thank you for reply, the idea is to get all employees who satisfies the condition (sal>=3000) and at the same time I want to know their managers of all levels regardless of manager's sal in a tree structure. Within a SELECT statement, a simple CASE expression allows only an equality check; no other comparisons are made. You cannot combine aggregate and non-aggregate SQL functions in the same formula definition. The previous question, it is a y object and not x that needs to be constructed. ALL RIGHTS RESERVED. JavaTpoint offers college campus training on Core Java, Advance Java, .Net, Android, Hadoop, PHP, Web Technology and Python. I had to spend only min or so to get a hold of this concept(start with, connect by). To avoid cross-scripting (XSS) vulnerabilities, search column results with formulas that contain