title: Error in changing column length in Postgres
body: <p>I am trying to change the column size from 100 to 150 varchar data type using following query:</p>
  <pre><code>alter table data_warehouse.tbl_abc
  alter column first_nm varchar(150) null;
  </code></pre>
  <p>Getting the following error:</p>
  <blockquote>
  <p>SQL Error [42601]: ERROR: syntax error at or near &quot;varchar&quot;
  Position: 77</p>
  </blockquote>