Isolation Level (Database) 편집하기 (부분)

==Examples==
===Read Uncommitted Example===
<syntaxhighlight lang="sql">
-- Transaction A
BEGIN TRANSACTION;
UPDATE accounts SET balance = 500 WHERE account_id = 1;

-- Transaction B
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
SELECT balance FROM accounts WHERE account_id = 1; -- Reads uncommitted balance of 500.

-- Transaction A
ROLLBACK; -- Balance reverts, but Transaction B already used dirty data.
</syntaxhighlight>
===Repeatable Read Example===
<syntaxhighlight lang="sql">
-- Transaction A
BEGIN TRANSACTION;
SELECT balance FROM accounts WHERE account_id = 1; -- Reads balance as 1000.

-- Transaction B
BEGIN TRANSACTION;
UPDATE accounts SET balance = 800 WHERE account_id = 1;
COMMIT;

-- Transaction A
SELECT balance FROM accounts WHERE account_id = 1; -- Still reads balance as 1000 due to Repeatable Read.
COMMIT;
</syntaxhighlight>
===Serializable Example===
<syntaxhighlight lang="sql">
-- Transaction A
BEGIN TRANSACTION;
SELECT COUNT(*) FROM orders WHERE status = 'pending';

-- Transaction B
BEGIN TRANSACTION;
INSERT INTO orders (order_id, status) VALUES (123, 'pending');
-- Blocked until Transaction A completes to ensure serializability.
</syntaxhighlight>