oracle-sqldeveloper

I'm trying to optimize a query but don't quite understand some of the information returned from Explain Plan . Can anyone tell me the significance of the OPTIONS and COST columns? In the OPTIONS column, I only see the word FULL. In the COST column, I can deduce that a lower cost means a faster query. But what exactly does the cost value represent and what is an acceptable threshold? Jeffrey Kemp The output of EXPLAIN PLAN is a debug output from Oracle's query optimiser. The COST is the final output of the Cost-based optimiser (CBO), the purpose of which is to select which of the many different

I'm trying to connect to an oracle database with SQL Developer. I've installed the .Net oracle drivers and placed the tnsnames.ora file at C:\Oracle\product\11.1.0\client_1\Network\Admin I'm using the following format in tnsnames.ora: dev = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.XXX.XXX)(PORT = XXXX)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = idpdev2) ) ) In SQL Developer, when I try to create a new connection, no TNS-names show up as options. Is there something I'm missing? JaseAnderson SQL Developer will look in the following location in this order for a

I am creating my employee table in Oracle and for emp_date I would like to make it so the date of birth is not way back in the past and can not be set in the future? Is this too complex to implement in the CREATE TABLE statement? if so then I guess I have to skip it because that is the part where I have to create the constraints. , emp_dob DATE NOT NULL CREATE TABLE employee(emp_id NUMBER(4) PRIMARY KEY , emp_name VARCHAR2(40) NOT NULL , emp_address VARCHAR2(60) NOT NULL , emp_tel NUMBER(11) NOT NULL , CONSTRAINT emp_tel_length CHECK (LENGTH(emp_tel) BETWEEN 9 and 11) , emp_dob DATE NOT NULL ,

I have a table "Images" with two fields: Name VARCHAR2 Data BLOB I would like to export that table to a .sql file which I could import on another system. I tried to do so using the "Database unload" assistant of Oracle SQL Developer. However the generated file does just have the content for the names in it but not the data. Thus after importing I would end up with all the names but the data field would be null everywhere. I'd really prefer it just to be one file (I saw some examples that included dumping the data to one file per field on the fs...) Is it possible to generate such a script with

I see that Oracle 11g or 12c doesn't have the download files for OS X. However, there is a version of the SQL Developer available for OS X. What's the point of the SQL Developer when you don't have a database? How do I install the Oracle database (preferable 12c or 11g Express Edition) on OS X? Alex Poole You can't install the database server software directly on OS X 1 . Oracle made a decision some time ago not so support it any more, presumably because it wasn't used enough to justify the costs involved. I seem to recall its demise roughly coincided with Apple dropping their Xserve line, but

I am using Oracle SQL Developer and trying to export a table to a CSV file. Some of the fields are CLOB fields, and in many cases the entries are truncated when the export happens. I'm looking for a way to get the whole thing out, as my end goal is to not use Oracle here (I received an Oracle dump - which was loaded into an oracle db, but am using the data in another format so going via CSV as an intermediary). If there are multiple solutions to this, given that it is a one time procedure for me, I don't mind the more hack-ish type solutions to more involved "do it right" solutions. JD Long if

The whole question is pretty much in the title. For each row of the table I'd like to select the maximum of a subset of columns. For example, from this table name m1 m2 m3 m4 A 1 2 3 4 B 6 3 4 5 C 1 5 2 1 the result would be name max A 4 B 6 C 5 The query must be compatible oracle 8i. Given this test data ... SQL> select * 2 from your_table 3 / NAME M1 M2 M3 M4 ---- ---------- ---------- ---------- ---------- A 1 2 3 4 B 6 3 4 5 C 1 5 2 1 SQL> ... a straightforward GREATEST() call will give the desired result: SQL> select name 2 , greatest(m1,m2,m3,m4) 3 from your_table 4 / NAME GREATEST(M1,M2

This question already has an answer here: How do I ignore ampersands in a SQL script running from SQL Plus? 7 answers I want to insert special character & in my insert statement. My insert is: INSERT INTO STUDENT(name, class_id) VALUES ('Samantha', 'Java_22 & Oracle_14'); If I try to run this query I am getting a popup and it asks me to enter value for Oracle_14 . How can I enter special characters like & in the insert statement for oracle db? If you are in SQL*Plus or SQL Developer, you want to run SQL> set define off; before executing the SQL statement. That turns of the checking for