RCHAR</span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">255</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">NOT</span><span class="token plain"> </span><span class="token boolean" style="color:#36acaa">NULL</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">UNIQUE</span><span class="token punctuation