A Solr index does not need a unique key, but almost all indexes use one.
http://wiki.apache.org/solr/UniqueKey
Try the below query passing id as id instead of titleid..
<document>
<entity name="title" query="SELECT id, title FROM
name"></entity>
</document>
A proper dataimport config will look like,
<entity name="relationship_entity" query="select id,name,value
from
table">
<field column="id" name="idSchemaFieldName"/>
<field column="name" name="nameSchemaFieldName"/>
<field column="value" name="valueSchemaFieldName" />
</entity>
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