mysql - mysql查询中可以保留join解释语句吗？

Question

我想左加入这样的解释语句。实际上需要检索列的数据类型，并且列存储在另一个名为“wyspesific”的表中。

select 
st.segnam as Segment,
st.typnam as 'Sub-Segment',
group_concat(distinct ws.fldnam) as 'Field Tag Name (database)', 
group_concat(distinct ws.fldcap) as 'Field Name Label',
concat('(', group_concat(distinct of.optcap order by of.optcap desc ),')' ) as optionFieldLabel,
concat('(', group_concat(distinct of.optval order by of.optcap desc ),')' ) as optionFieldValue,
ws.isopt as isOptionField
from shiptype st
left join wyspecific ws on ws.wytypid = st.wytypid and ws.enabled = 'Y'
left join optionfields of on of.fldnam = ws.fldnam and of.deleted = 'N'
left join ( explain shipspecific ) as v on ws.fldnam = v.Field
where st.segid in(6,4,8,9,10,11,12 ) and ws.enabled = 'Y'
group by ws.fldid
order by st.segid

任何建议或想法将不胜感激。

非常感谢。

Answer 1

您应该从 INFORMATION_SCHEMA.COLUMNS 获取此信息相反:

SELECT COLUMN_NAME, DATA_TYPE FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME='shipspecific' AND TABLE_SCHEMA=DATABASE()