我有一個類似於此的數據集。基本上它由單詞文檔的不同頁面組成,表示頁碼和頁面的全文。(Cloudant DB Java API)執行類似操作選擇與WHERE子句不同
{
"_id": "4b36u6vwkZH16H5vmc24sBfuZk0CRqfP",
"_rev": "1-r5WQDAJPPuUP0oLapZrMiMRd6rOaTIz9",
"FILE_NAME": "sample.doc",
"PAGE_NUM": 1,
"PAGE_FULLTEXT": "hello world",
},
{
"_id": "nDIKw5JUWFWVD8m7HEODMa1vNI5gFEXS",
"_rev": "1-nEp7zsuaneJj2AInyPpeBWDNP90ZGpWQ",
"FILE_NAME": "sample.doc",
"PAGE_NUM": 2,
"PAGE_FULLTEXT": "this is john doe",
},
{
"_id": "vCTlNbNk3X893FkWSYnn87L9j371taYZ",
"_rev": "1-oJPspiBHRPeT99m8VPV9qoDTTBoJ9tVK",
"FILE_NAME": "sample-2.doc",
"PAGE_NUM": 1,
"PAGE_FULLTEXT": "this is another document",
},
{
"_id": "2FSDuaEa5bYtP2l7lEgMnqMnqsZpMJUs",
"_rev": "1-ZQRkvfMluu0NQWYH2FUATuXy9uNtOGyk",
"FILE_NAME": "sample-2.doc",
"PAGE_NUM": 2,
"PAGE_FULLTEXT": "page 2 of sample-2.doc",
},
{
"_id": "RET7G6hUU9zSplgW7FIXWKwIVex2NEmI",
"_rev": "1-mlryGv830RNllPwFT7JDDvJoKXuvxAXD",
"FILE_NAME": "sample-3.doc",
"PAGE_NUM": 1,
"PAGE_FULLTEXT": "hello lionel",
},
{
"_id": "VBL6BJBevcvUc6EsJ68bAjHuGRJ6zvMt",
"_rev": "1-fPIJQHKCB2WitR74l1X8I6TOBMhMeCWF",
"FILE_NAME": "sample-3.doc",
"PAGE_NUM": 2,
"PAGE_FULLTEXT": "page hello 2 of sample-3.doc",
}
到目前爲止,我能夠通過檢查帖子How do I do the SQL equivalent of "DISTINCT" in CouchDB?
的一個做選擇重複計數類似的查詢現在的問題是,我怎麼會是能夠通過數據集,然後組搜索他們通過FILE_NAME(輸出時使用SQL代碼是SELECT DISTINCT FILE_NAME WHERE PAGE_FULLTEXT像「%你好%」相似)
這太好了。絕對是我在尋找的。謝謝。 – Jigs