You can master Database development, which is essential for mobile/web development, through MySQL.

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DBMS/RDBMS

Yoon Jae-seong's First MySQL DataBase

<h4 style="box-sizing: inherit; margin: 0px; padding: 0px; font-size: 1.5rem; font-weight: 400; color: #000a12; font-family: 'Noto Sans KR', -apple-system, system-ui, BlinkMacSystemFont, 'Apple SD Gothic Neo', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', Helvetica; background-color: #ffffff;"> News about the opening of Part 3 of the newly produced Courtrin course series in August 2020</h4>

<p style="box-sizing: inherit; margin: 0px 0px 1em; padding: 0px; line-height: 1.6; font-size: 16px; color: #333333; font-family: 'Noto Sans KR', -apple-system, system-ui, BlinkMacSystemFont, 'Apple SD Gothic Neo', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', Helvetica; background-color: #ffffff;"> To celebrate the opening of <a href="https://www.inflearn.com/course/%EC%86%8C%ED%94%84%ED%8A%B8%EC%BA%A0%ED%8D%BC%EC%8A%A4-%EC%BD%94%ED%8B%80%EB%A6%B0-%EC%95%88%EB%93%9C%EB%A1%9C%EC%9D%B4%EB%93%9C-1" target="_blank" rel="noopener noreferrer">Yoon Jae-seong's Kotlin-based Android App Development Part 3 - Data Management and Network</a> Course, we are offering a 30% discount.
<p style="box-sizing: inherit; margin: 0px 0px 1em; padding: 0px; line-height: 1.6; font-size: 16px; color: #333333; font-family: 'Noto Sans KR', -apple-system, system-ui, BlinkMacSystemFont, 'Apple SD Gothic Neo', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', Helvetica; background-color: #ffffff;">
<span style="box-sizing: inherit; color: #000a12; font-family: 'Noto Sans KR', -apple-system, system-ui, BlinkMacSystemFont, 'Apple SD Gothic Neo', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', Helvetica; font-size: 16px; background-color: #ffffff;">
<p style="box-sizing: inherit; margin: 0px 0px 1em; padding: 0px; line-height: 1.6; font-size: 16px; color: #333333; font-family: 'Noto Sans KR', -apple-system, system-ui, BlinkMacSystemFont, 'Apple SD Gothic Neo', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', Helvetica; background-color: #ffffff;"> thank you

We are pleased to announce the opening of a new course.