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Create Trigger that updates the same table before (or after ??) the Insert
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How to check if an array value exists?
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Proposal to merge tags [existdb] and [exist]
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INSERT INTO if not exists SQL server
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How do I update if exists, insert if not (AKA "upsert" or "merge") in MySQL?
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Simulate CREATE DATABASE IF NOT EXISTS for PostgreSQL?
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Fastest way to determine if record exists
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Column name or number of supplied values does not match table definition. What shoul I do?
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Check that criteria are met in a before insert trigger
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Oracle: how to UPSERT (update or insert into a table?)
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How do I conditionally create a stored procedure in SQL Server?
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How to compare two tables column by column in oracle
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"Insert if not exists" statement in SQLite
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Access: create table if it does not exist
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if block fails to create temp table in a procedure