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

Author: abh1navv

sql-queries-5/insert-or-update-if-exists/merge-sql-server.sql

@@ -0,0 +1,19 @@
+CREATE TABLE employees (
+    id INT PRIMARY KEY,
+    name VARCHAR(50),
+    department VARCHAR(50)
+);
+
+
+INSERT INTO employees (id, name, department) VALUES (1, 'Alice', 'Finance');
+
+MERGE INTO employees AS target
+USING (SELECT 1 AS id, 'Alice' AS name, 'Accounting' AS department) AS source
+ON target.id = source.id
+WHEN MATCHED THEN
+    UPDATE SET name = source.name, department = source.department
+WHEN NOT MATCHED THEN
+    INSERT (id, name, department) VALUES (source.id, source.name, source.department);
+
+
+SELECT * from employees;

sql-queries-5/insert-or-update-if-exists/on-conflict-postgresql.sql

@@ -0,0 +1,12 @@
+CREATE TABLE employees (
+    id INT PRIMARY KEY,
+    name VARCHAR(50),
+    department VARCHAR(50)
+);
+
+INSERT INTO employees (id, name, department) VALUES (1, 'Alice', 'Finance');
+
+INSERT INTO employees (id, name, department) VALUES (1, 'Alice', 'Accounting')
+ON CONFLICT (id) DO UPDATE SET name = 'Alice', department = 'Accounting';
+
+SELECT * from employees;

sql-queries-5/insert-or-update-if-exists/on-duplicate-key-mysql.sql

@@ -0,0 +1,12 @@
+CREATE TABLE employees (
+    id INT PRIMARY KEY,
+    name VARCHAR(50),
+    department VARCHAR(50)
+);
+
+INSERT INTO employees (id, name, department) VALUES (1, 'Alice', 'Finance');
+
+INSERT INTO employees (id, name, department) VALUES (1, 'Alice', 'Accounting')
+ON DUPLICATE KEY UPDATE name = 'Alice', department = 'Accounting';
+
+SELECT * from employees;

sql-queries-5/insert-or-update-if-exists/replace-mysql.sql

@@ -0,0 +1,11 @@
+CREATE TABLE employees (
+    id INT PRIMARY KEY,
+    name VARCHAR(50),
+    department VARCHAR(50)
+);
+
+INSERT INTO employees (id, name, department) VALUES (1, 'Alice', 'Finance');
+
+REPLACE INTO employees (id, name, department) VALUES (1, 'Alice', 'Accounting');
+
+SELECT * from employees;