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How to Check for Duplicates Before Inserting Into SQL

When you insert new records into an SQL database, you may run into issues where you accidentally overwrite records that are already present due to a duplication issue. You can use a simple alteration ... read more

Check for duplicates before insert

That said, I worked out a few errors in the jsp, and have it down to an SQL syntax error ... the only way to prevent inserting it again, is doing a select first. And to answer your question "Check for ... read more

SQL Server Removing Duplicates

Before we run through them if you want to follow along then run the following SQL to create two ... to do a SELECT DISTINCT into a new table to remove the duplicates, then we’re having to clear out ... read more

MySQL Error Handling using the Signal and Resignal Statements

MySQL introduced the SIGNAL and RESIGNAL statements ... check if address exists SELECT COUNT(*) INTO address_count FROM address WHERE address.address_id = address_id; IF address_count != 1 THEN SIGNAL ... read more

How to check for duplicate records on multiple insert

What i cant seem to get my head around is to check to make sure that there are no duplicates in any of the ... I created the usual insert sql statement to insert all of the updated rows back into the ... read more

Guru: Handling Constraint Violations In RPG

ALTER TABLE EMPLOYEE ADD CONSTRAINT FK_EMPLOYEE_TO_DEPARTMENT_ERR0001 FOREIGN KEY( DEPARTMENT_CODE ) REFERENCES DEPARTMENT ( DEPARTMENT_CODE ) ON DELETE RESTRICT ON UPDATE RESTRICT ; A check ... read more

Loading CSV Files Using Dynamic SQL

Speaking at SQL ... into the database. You will also need to check to see if the file already has a corresponding table, and if does, you will need to see if the data that you are importing already ... read more

How to Implement Robust and Scalable Transactions Across Documents with MongoDB

and consequently people are longing for multi-document transactions to port over their SQL code. One natural workaround is to leverage the power of documents: instead of many rows and relationships ... read more

Fixing a Race Condition

Unfortunately we didn’t add uniqueness constraints at the database level when we created the scheduling system back in 2013, so a race condition somewhere can still add duplicate interviewers into ... ... read more

Oracle's Bulk Collect and Limit Can Be A Problem

emp_c.count loop 15 insert into emp_test (empno, ename, sal) 16 values (emp_c(i).empno, emp_c(i).ename, emp_c(i).sal); 17 end loop; 18 19 end loop; 20 21 commit; 22 23 end; 24 / PL/SQL procedure ... read more

SQL Server Query Design

Before I get to the syntax, however, there are a few formalities to deal with. There are dozens of Transact-SQL commands ... You can also insert data into a table based on the result of a SELECT ... read more

How To Insert With A Common Table Expression

How do I write an SQL statement to copy all records from one file to another avoiding duplicates on part number? –Trent This is a new wrinkle on a challenge about which I have written before ... 8,0 ) ... read more