各行ロックに対するキーであるカラムと非キーであるカラムにおけるロックの種類（共有ロック or 排他ロック）
| name | key | not key |
|---|---|---|
| FOR UPDATE | EXCLUSIVE LOCK | EXCLUSIVE LOCK |
| FOR NO KEY UPDATE | × | EXCLUSIVE LOCK |
| FOR SHARE | SHARE LOCK | SHARE LOCK |
| FOR KEY SHARE | SHARE LOCK | × |
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