When you admit new annal into an SQL database, you may run into issues area you accidentally overwrite annal that are already present due to a duplication issue. You can use a simple about-face on your admittance command that will analysis for duplicates afore assuming the admit and — if they are begin — will not accomplish the insert.
Form your antecedent admittance query, such as “INSERT INTO your_table (column1,column2) VALUES (‘1′,’a’);”
Alter the concern by abacus a aphorism for what to do if a alike key is found, such as “INSERT INTO your_table (column1,column2) VALUES (‘1′,’a’) ON DUPLICATE KEY UPDATE column1=’1′, column2=’a’;”
How To Write A Sql Query To Find Duplicates – How To Write A Sql Query To Find Duplicates
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