feat(sql): utf-8

docs/2022-07-31-sql.html

@@ -144,6 +144,23 @@
         >
       </li>
     </ul>
+    <h2 id="user-content-be-careful-with-utf-8">
+      <a class="heading-link" href="#be-careful-with-utf-8"
+        >Be careful with UTF-8<span
+          aria-hidden="true"
+          class="octicon octicon-link"
+        ></span
+      ></a>
+    </h2>
+    <p>TLDR with MySQL:</p>
+    <div class="highlight highlight-source-sql">
+      <pre><span class="pl-k">CREATE</span> <span class="pl-k">TABLE</span> <span class="pl-en">ekyc_approved</span>
+(
+    id <span class="pl-k">varchar</span>(<span class="pl-c1">30</span>) <span class="pl-k">NOT NULL</span>,
+    <span class="pl-k">PRIMARY KEY</span> (id),
+) ENGINE <span class="pl-k">=</span> InnoDB
+  DEFAULT CHARSET <span class="pl-k">=</span> utf8mb4;</pre>
+    </div>
     <h2 id="user-content-be-careful-with-null">
       <a class="heading-link" href="#be-careful-with-null"
         >Be careful with NULL<span

posts/2022-07-31-sql.md

@@ -70,6 +70,19 @@ Use `EXPLAIN` to check if index is used or not:
 - [For MySQL 5.7](https://dev.mysql.com/doc/refman/5.7/en/explain-output.html)
 - [For MySQL 8.0](https://dev.mysql.com/doc/refman/8.0/en/explain-output.html)
 
+## Be careful with UTF-8
+
+TLDR with MySQL:
+
+```sql
+CREATE TABLE ekyc_approved
+(
+    id varchar(30) NOT NULL,
+    PRIMARY KEY (id),
+) ENGINE = InnoDB
+  DEFAULT CHARSET = utf8mb4;
+```
+
 ## Be careful with NULL
 
 If compare with field which can be NULL, remember to check NULL for safety.