#openGauss #入门 #安装 #数据库 #开源
知识来源：docs-opengauss.osinfra.cn/zh/
例如：
openGauss=# SELECT ts_headline('english',
'The most common type of search
is to find all documents containing given query terms
and return them in order of their similarity to the
query.',
to_tsquery('english', 'query & similarity'));
ts_headline
------------------------------------------------------------
containing given <b>query</b> terms
and return them in order of their <b>similarity</b> to the
<b>query</b>.
(1 row)
openGauss=# SELECT ts_headline('english',
'The most common type of search
is to find all documents containing given query terms
and return them in order of their similarity to the
query.',
to_tsquery('english', 'query & similarity'),
'StartSel = <, StopSel = >');
ts_headline
-------------------------------------------------------
containing given <query> terms
and return them in order of their <similarity> to the
<query>.
(1 row)
ts_headline使用原始文档，而不是tsvector摘录，因此使用起来会慢，应慎重使用。
#openGauss #入门 #安装 #数据库 #开源
