问题描述
由于某种原因,我无法在返回列表中包括“唯一”列。有什么建议吗?
此查询有效:
SELECT
m.tbl_name as table_name,il.name as key_name,ii.name as column_name,case il.origin when 'pk' then 1 else 0 END as is_primary,il.partial,il.seq as seq_in_index
FROM sqlite_master AS m,pragma_index_list(m.name) AS il,pragma_index_info(il.name) AS ii
WHERE
m.type = 'table'
但是此查询失败
SELECT
m.tbl_name as table_name,case il.unique when 1 then 1 else 0 END as is_unique,pragma_index_info(il.name) AS ii
WHERE
m.type = 'table'
解决方法
对于SQLite(和其他数据库),unique
是keyword(保留字),因此必须将其用反引号或方括号或双引号引起来:
case il.[unique] when 1 then 1 else 0 END as is_unique
但是您也可以写:
il.[unique] as is_unique