![]() No error is returned when the IGNORE conflict resolution algorithm is used. Other rows before and after the row that contained the constraint violation are inserted or updated normally. When an applicable constraint violation occurs, the IGNORE resolution algorithm skips the one row that contains the constraint violation and continues processing subsequent rows of the SQL statement as if nothing went wrong. If that index is UNIQUE, the query can be simplified further using OR IGNORE clause: INSERT OR IGNORE SQLite INSERT is used to insert records into a specified table of the database. You can simplify it to: INSERT INTO target.child (value, parent, vtype)Īn index on child (vtype, parent) would help I think for performance. The 2 of the 3 table references in the correlated subquery are not needed as they join to the same tables in the main query and on primary keys. a.out Opened database successfully If you are going to use C++ source code, then you can compile your code as follows g++ test. You can change your path as per your requirement. There are a number of NuGet packages with similar names. Now, let's compile and run the above program to create our database test.db in the current directory. Is it possible to optimize this incredibly slow query w/o new indexes? It's a big problem - I cannot modify at least target db at this moment.īesides adding indexes (which you say is not allowed), the query is unnecessarily complex. Install the SQLite NuGet package Use the NuGet package manager to search for the sqlite-net-pclpackage and add the latest version to your. There are a number of NuGet packages with similar names. Use the NuGet package manager to search for the sqlite-net-pcl package and add the latest version to your. There are two meaningful versions of the SQLite insert statement.
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