我想检索Table1
例如 我有两张桌子
1。 #tempLastSold
2。 ItemRelation
#tempLastSold记录
ID ExtendedDescription StoreID
160641 FA012 1400 //ID present in ID of ItemRelation
160641 FA012 2001 //ID present in ID of ItemRelation
160632 FA003 1400 //ID present in ChildID3 of ItemRelation
160632 FA003 2001 //ID present in ChildID3 of ItemRelation
156824 25298 2001 //ID present in ID of ItemRelation
158430 161-18-132 1302 //ID present in ChildID2 of ItemRelation
注意 #tempLastSold 的ID可能出现在 ItemRelation的任何字段（可能是 ID，ChildID1，ChildID2，ChildID3）表
ItemRelation记录
ID ChildID1 ChildID2 ChildID3
160641 160642 Null Null
160631 160634 160633 160632
156824 Null Null Null
158433 158431 158430 Null
1 1A 1B 1C
2 2A 2B 2C
2 3A 3B 3C
我想显示 #tempLastSold
中不存在的 ItemRelation 的记录#tempLastSold 拥有数百万条记录，
ItemRelation 拥有30,000个recorsds
我试过这段代码
select ir.ID,
ir.ItemLookupCode,
ir.ChildID1,
ir.ChildItemLookupCode1,
ir.ChildID2,
ir.ChildItemLookupCode2,
ir.ChildID3,
ir.ChildItemLookupCode
FROM [HQMatajer].[dbo].[ItemRelation] ir
left join #tempLastSold tLs on tLs.ID != ir.id
left join #tempLastSold tLs1 on tLs1.ID !=ir.ChildID1
left join #tempLastSold tLs2 on tLs2.ID !=ir.ChildID2
left join #tempLastSold tLs3 on tLs3.ID != ir.ChildID3
但它检索的记录超过60,000。
答案 0 :(得分：2)
这是你想要的吗？
select ir.*
from ItemRelation ir
where not exists (select 1
from #tempLastSold tls
where tls.id = ir.id
) or
(ir.childid1 is not null and
not exists (select 1
from #tempLastSold tls
where tls.id = ir.childid1
)
) or
(ir.childid2 is not null and
not exists (select 1
from #tempLastSold tls
where tls.id = ir.childid2
)
) or
(ir.childid3 is not null and
not exists (select 1
from #tempLastSold tls
where tls.id = ir.childid3
)
);
为了提高性能，您需要3tempLastSold(id)上的索引。
您还可以将查询简化为：
select ir.*, g.which
from ItemRelation ir cross join
(values (id, 'id'), (childid1, 'childid1'), (childid2, 'childid2'), (childid3, 'childid3')) v(id, which)
where v.id is not null and
not exists (select 1
from #tempLastSold tls
where tls.id = ir.id
);
这可以轻松显示缺少哪一列。
编辑：
您也可以使用left join表达此信息。逻辑有点棘手。您需要查找匹配项，然后查看不匹配的位置。对于id列，这看起来像：
select ir.*
from ItemRelation ir left join
#tempLastSold tls
on tls.id = ir.id
where tls.id is null;
您的版本会找到所有非NULL值的匹配项，因为tls中始终会有一条与给定值不匹配的记录（非NULL ）价值。
答案 1 :(得分：1)
使用单个public class SearchActivity extends AppCompatActivity {
private Socket socket;
public ArrayList<SearchResultUser> searchResultUsers;
public SearchAdapter searchAdapter;
public RecyclerView rvSearchResults;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_search);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
setUpConnectionToServer();
searchResultUsers = new ArrayList<>();
searchAdapter = new SearchAdapter(searchResultUsers);
rvSearchResults = (RecyclerView)findViewById(R.id.rvSearchResults);
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(this);
rvSearchResults.setLayoutManager(mLayoutManager);
rvSearchResults.setItemAnimator(new DefaultItemAnimator());
rvSearchResults.setAdapter(searchAdapter);
rvSearchResults.addOnItemTouchListener(new RecyclerTouchListener(this,
rvSearchResults, new RecyclerViewClickListener() {
@Override
public void onClick(View view, int position) {
}
@Override
public void onLongClick(View view, int position) {
}
}));
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
private void setUpConnectionToServer() {
try {
socket = IO.socket("http://youripaddress:3000");
} catch (URISyntaxException e) {
throw new RuntimeException(e);
}
socket.connect();
socket.on("search", searchListener);
}
private Emitter.Listener searchListener = new Emitter.Listener(){
@Override
public void call(final Object... args){
runOnUiThread(new Runnable() {
@Override
public void run() {
//clear current search result set
searchResultUsers.clear();
searchAdapter.notifyDataSetChanged();
//get new search result
JSONArray jsonArray = (JSONArray)args[0];
try {
//loop through all new search results
for(int i = 0; i < jsonArray.length(); i++){
//for every new search result create JSON object
JSONObject jsonObject = jsonArray.getJSONObject(i);
//from every JSON object create SearchResultUser model object
SearchResultUser mySearchResultUser = new SearchResultUser(jsonObject.getInt("id"),
jsonObject.getString("name"));
//add every new SearchResultUser model object to the array list
searchResultUsers.add(mySearchResultUser);
}
} catch (JSONException e) {
e.printStackTrace();
}
//notify the adapter of data set change
searchAdapter.notifyDataSetChanged();
}
});
}
};
@Override
protected void attachBaseContext(Context base) {
super.attachBaseContext(CalligraphyContextWrapper.wrap(base));
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_search, menu);
// Associate searchable configuration with the SearchView
// SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
SearchView searchView = (SearchView) MenuItemCompat.getActionView(menu.findItem(R.id.action_search_activity));
// searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
searchView.setOnQueryTextListener(onQueryTextListener);
return super.onCreateOptionsMenu(menu);
}
public SearchView.OnQueryTextListener onQueryTextListener = new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
//Toast.makeText(SearchActivity.this,"search query => " + query, Toast.LENGTH_LONG).show();
//socket.emit("search",query);
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
//Toast.makeText(SearchActivity.this,"newText query => " + newText, Toast.LENGTH_SHORT).show();
socket.emit("search",newText);
if(newText.equals("")){
searchResultUsers.clear();
searchAdapter.notifyDataSetChanged();
}
return false;
}
};
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_search_activity) {
Log.d("test","clicked on search");
return true;
}
return super.onOptionsItemSelected(item);
}
}
public class SearchResultUser {
private int id;
private String name;
public SearchResultUser() {
}
public SearchResultUser(int id, String name) {
this.id = id;
this.name = name;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
public class SearchAdapter extends RecyclerView.Adapter<SearchAdapter.MyViewHolder> {
private ArrayList<SearchResultUser> searchResultUserList;
public class MyViewHolder extends RecyclerView.ViewHolder {
public ImageView ivProfileSearchResult;
public TextView tvUserNameSearchResult;
public MyViewHolder(View view) {
super(view);
ivProfileSearchResult = (ImageView) view.findViewById(R.id.ivProfileSearchResult);
tvUserNameSearchResult = (TextView) view.findViewById(R.id.tvUserNameSearchResult);
}
}
public SearchAdapter(ArrayList<SearchResultUser> searchResultUserList) {
this.searchResultUserList = searchResultUserList;
}
//this doen't work
public void update(ArrayList<SearchResultUser> searchResultUserList){
this.searchResultUserList.clear();
for (SearchResultUser searchResultUser: searchResultUserList) {
this.searchResultUserList.add(searchResultUser);
}
notifyDataSetChanged();
}
@Override
public SearchAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.search_result_item, parent, false);
return new SearchAdapter.MyViewHolder(itemView);
}
@Override
public void onBindViewHolder(SearchAdapter.MyViewHolder holder, int position) {
SearchResultUser searchResultUser = searchResultUserList.get(position);
holder.tvUserNameSearchResult.setText(searchResultUser.getName());
}
@Override
public int getItemCount() {
return searchResultUserList.size();
}
}
：
left joinrextester 演示：http://rextester.com/SBA83066
返回：
select ir.ID,
ir.ChildID1,
ir.ChildID2,
ir.ChildID3
from [dbo].[ItemRelation] ir
left join #tempLastSold tLs
on tLs.ID = ir.id
or tLs.ID = try_convert(int,ChildID1)
or tLs.ID = try_convert(int,ChildID2)
or tLs.ID = try_convert(int,ChildID3)
where tls.id is null;
使用+----+----------+----------+----------+
| ID | ChildID1 | ChildID2 | ChildID3 |
+----+----------+----------+----------+
| 1 | 1A | 1B | 1C |
| 2 | 2A | 2B | 2C |
| 2 | 3A | 3B | 3C |
+----+----------+----------+----------+
代替相同的结果
not exists()答案 2 :(得分：0)
您可以不在
中使用select * from #tempLastSold where ID not in (select id from ItemRelation Union all Select childid1 from ItemRelation union all Select childid2 from itemrelation union all select childid3 from ItemRelation )
答案 3 :(得分：0)
您的问题不是很清楚，您想要检索第1号表格中不再存在的内容吗？ 按表号2？ 或者您希望表1通过某些信息复制到表2？