How to join three tables in SQLite? I have three tables, one is Info, second is workForce and third is workDetails.
Table Info:id(PK),name,status,date,weather
Table WorkForce: id1(PK), subContractors,noOfPeople,noOfHours
Table WorkDetails:id2(PK),project,workDescription,TableInfo_id(FK) //contains multiple row
Table Info
ID NAME Weather Date Status
---------- ---------- ---------- ---------- ----------
1 Paul Sunny 15/10 MC
2 Allen Rainy 15/10 Working
Table WorkForce
ID1 SubContractors NoOfPeople NoOfHours
---------- -------------- ---------- ----------
1 AAA 2 2
2 BBB 3 1
Table WorkDetails
ID2 Project WorkDescription TableInfo_id
---------- ---------- -------------- ----------
1 A B 1
2 1
3 1
4 1
5 C D 2
6 2
7 2
8 2
Assume the name is Paul, so all the row with ID 1 and TableInfo_id 1 will be retrieved.
Here is what I tried so far
public Cursor readEntry(String name) {
String selectQuery = ("SELECT Weather,Date,Status,SubContractors,NumberOfPeople,NumberOfHours,TimeIn,TimeOut FROM "+TABLE_INFO+TABLE_WORKFORCE+TABLE_WORKDETAILS+ "WHERE Name= ? AND"+ID=ID1+ "AND"+ID=TableInfo_id);
Cursor c = database.query(TABLE_INFO,TABLE_WORKFORCE,TABLE_WORKDETAILS,new String[]{id,name,weather,date,status,iD1,subcontractors,numberOfPerson,numberOfHours,id2project,workDescription,TableInfo_id},MyDatabaseHelper.Name+"=?",
new String[] { String.valueOf(name)}, null, null, null, null,null,null,null,null,null,null,null,null);
if (c != null) {
c.moveToFirst();
}
return c;
}
My code seems like not working..how can I do to achieve this? Thanks
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