You did not close tags correctly. Try this, they will be in same column
<td><a href="https://stackoverflow.com/questions/42284211/<?php echo $row["description']; ?>">
<?php echo $row['post_title']; ?></a></td>
I hope this helps
Edit:
Also for not underlined link you can use this css attribute:
<td><a style="text-decoration: none;" href="https://stackoverflow.com/questions/42284211/<?php echo $row["description']; ?>">
<?php echo $row['post_title']; ?></a></td>
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solved Mysql combine link with title