25,562 Views. Oracle Database; 21 Comments. Does Oracle have a similar mechanism? How might I achieve this. How to check if a value (null/non null) exists in database table using stored pro; Check to see weather the column already exists, if not add the column; to check if a table exists; Is there a way to check the order in which SET INTEGRITY needs to be applied? How can I check if a table, sequence or trigger already exists so I don't try and create it? Suppose you are checking for the existence of a table named EMPLOYEE_SALARY. Equivalent for EXISTS() in an IF statement? Check if record exists using the Count() function. DROP TABLE IF EXISTS `table_name`; This way, if the table doesn't exist, the DROP doesn't produce an error, and the script can continue. Posted by preetipatil (Teradata) on Oct 26 at 2:44 AM . Trying to check is table exist before create in Oracle. Thanks in advance Ask Question Asked 9 years ago. Search for most of the post from Stackoverflow and others too. select NVL ((select 'Y' from dual where exists (select 1 from sales where sales_type = 'Accessories')),'N') as rec_exists from dual 1.Dual table will return 'Y' if record exists in sales_type table 2.Dual table will return null if no record exists in sales_type table and NVL will convert that to 'N' If it exists I will continue the other things or else I exit saying table doesn't exist. If the count is greater than 0 means, the records exist else not exist. Subject: [teradata-l] Check whether table exist or not using bteq. Oracle does not provide IF EXISTS clause in the DROP TABLE statement, but you can use a PL/SQL block to implement this functionality and prevent from errors then the table does not exist. The following Oracle PL/SQL block will use the count() function in implicit cursor to count the records for particular criteria. Can anyone tell me how to check if table exists or not.if table exist then insert records .if not exist create a table.is this possible using bteq? Find some query but it didn't work for me. Last Modified: 2013-05-08. set serveroutput on declare c varchar2(10); begin select case when exists (select * from my_table) then 'has rows' else 'no rows' end into c from dual; dbms_output.put_line(c); end; / Note that both the EXISTS and rownum = 1 version will stop on the first row found, and that's the point, so we don't need to read the whole table/index. Viewed 6k times 1. SELECT * FROM dba_tables where table_name = 'table_name'; Help to check if Oracle table exists. 2 Solutions. Active 4 years, 1 month ago. I realize I could use the following query to check if a table exists or not. Check for existence of a table; Q: Drop table and check if table exists Make sure to check the table name from the resultset with an equals match. The reason is that the getTables() does pattern matching on the query for the table and the _ character is a wildcard in SQL. Below are the examples to check if a record exists using PL/SQL in Oracle. I have a script where I am creating a lot of tables with sequences and triggers. IF((SELECT count(*) FROM dba_tables where table_name = 'EMPLOYEE') <= 0) THEN create table EMPLOYEE ( ID NUMBER(3), NAME VARCHAR2(30) NOT NULL ) END IF; dyarosh asked on 2013-05-06. You can query catalogs views (ALL_TABLES or USER_TABLE i.e) to check if the required table exists: In the dialect for procedural SQL in MSSQL and Sybase, there's a useful little idiom for checking whether rows exist on a table, and it looks like this... if exists (select 'x' from foo where bar) /* found, do something */ else /* not found, do something else */ I am trying to write a script which allows a user to select the what manipulation he needs to do on a table. 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