PostgreSQL 判断字符串包含

select position('aa' in 'abcd');
position 
----------
        0
(1 row)
select position('ab' in 'abcd');
position 
----------
        1
(1 row)
select position('ab' in 'abcdab');
position 
----------
        1
(1 row)

select a.* from ls_emp_info a left join ls_emp_post b on a.id = b.emp_id
-- 判断字符串是否包含
-- where  position( '2' in b.post_no) > 0;
where position( #{empInfo.postNo} in b.post_no) > 0;

select strpos('abcd','aa');
 strpos 
--------
      0
(1 row)
select strpos('abcd','ab');
 strpos 
--------
      1
(1 row)
select strpos('abcdab','ab');
 strpos 
--------
      1
(1 row)

select 'abcd' ~ 'aa';
 ?column? 
----------
 f
(1 row)
select 'abcd' ~ 'ab';
 ?column? 
----------
 t
(1 row)
select 'abcdab' ~ 'ab';
 ?column? 
----------
 t
(1 row)

select regexp_split_to_array('abcd','') @> array['b','e'];
 ?column? 
----------
 f
(1 row)
select regexp_split_to_array('abcd','') @> array['a','b'];
 ?column? 
----------
 t
(1 row)

select regexp_split_to_array('abcd','') @> array['a','a'];
 ?column? 
----------
 t
(1 row)
select regexp_split_to_array('abcd','') @> array['a','c'];
 ?column? 
----------
 t
(1 row)
select regexp_split_to_array('abcd','') @> array['a','c','a','c'];
 ?column? 
----------
 t
(1 row)