Merge pull request #237 from abh1navv/main

SQL-294 - Insert into SQL table or update if exists

Author: lor6

sql-queries-7/README

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+### Relevant Articles:
+

sql-queries-7/insert-or-update-if-exists/merge-sql-server.sql

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+INSERT INTO Department (id, name, code) VALUES (1, 'Computer Science', 'CS');
+
+MERGE INTO Department AS target
+USING (SELECT 1 AS id, 'Computer Science' AS name, 'CSE' AS code) AS source
+ON target.id = source.id
+WHEN MATCHED THEN
+    UPDATE SET name = source.name, code = source.code
+WHEN NOT MATCHED THEN
+    INSERT (id, name, code) VALUES (source.id, source.name, source.code);
+
+SELECT * from Department;

sql-queries-7/insert-or-update-if-exists/on-conflict-postgresql.sql

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+INSERT INTO Department (id, name, code) VALUES (1, 'Computer Science', 'CS');
+
+INSERT INTO Department (id, name, code) VALUES (1, 'Computer Science', 'CSE')
+ON CONFLICT (id) DO UPDATE SET name = 'Computer Science', code = 'CSE';
+
+SELECT * from Department;

sql-queries-7/insert-or-update-if-exists/on-duplicate-key-mysql.sql

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+INSERT INTO Department (id, name, code) VALUES (1, 'Computer Science', 'CS');
+
+INSERT INTO Department (id, name, code) VALUES (1, 'Computer Science', 'CSE')
+ON DUPLICATE KEY UPDATE name = 'Computer Science', code = 'CSE';
+
+SELECT * from Department;

sql-queries-7/insert-or-update-if-exists/replace-mysql.sql

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+INSERT INTO Department (id, name, code) VALUES (1, 'Computer Science', 'CS');
+
+REPLACE INTO Department (id, name, code) VALUES (1, 'Computer Science', 'CSE');
+
+SELECT * from Department;