no such column: _id SQLite error Android

I'm getting a no such column: _id error. YES there is a column "_id" in my journals table.

I'm getting the error with this code:

 mDb.execSQL("UPDATE "+DATABASE_PLANTS_TABLE+" SET "+ KEY_PLANT_DAYS+ 
            " = (SELECT COUNT(*) FROM "+DATABASE_PLANTS_TABLE+" WHERE "
              +DATABASE_JOURNAL_TABLE+"."+KEY_JROWID+" = "+DATABASE_PLANTS_TABLE +"."
                        +KEY_PLANT_HOMEID+")");

The following code DOES work:

mDb.execSQL("UPDATE "+DATABASE_JOURNAL_TABLE+" SET "+KEY_JOURNAL_PLANTS+
                    " = (SELECT COUNT(*) FROM "+DATABASE_PLANTS_TABLE+" WHERE "
                    +DATABASE_JOURNAL_TABLE+"."+KEY_JROWID+" = "+DATABASE_PLANTS_TABLE +"."
                    +KEY_PLANT_HOMEID+")");

LogCat:

08-21 00:07:46.614: ERROR/Database(12943): Failure 1 (no such column: journals._id) on 0x421470 when preparing 'UPDATE plants SET days = (SELECT COUNT(*) FROM plants WHERE journals._id = plants.homeid)'.
08-21 00:07:46.614: DEBUG/AndroidRuntime(12943): Shutting down VM
08-21 00:07:46.614: WARN/dalvikvm(12943): threadid=3: thread exiting with uncaught exception (group=0x4001b390)
08-21 00:07:46.614: ERROR/AndroidRuntime(12943): Uncaught handler: thread main exiting due to uncaught exception
08-21 00:07:46.624: ERROR/AndroidRuntime(12943): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.growjournal.beta/com.grower.beta.plantsList}: android.database.sqlite.SQLiteException: no such column: journals._id: UPDATE plants SET days = (SELECT COUNT(*) FROM plants WHERE journals._id = plants.homeid)
08-21 00:07:46.624: ERROR/AndroidRuntime(12943):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2596)
08-21 00:07:46.624: ERROR/AndroidRuntime(12943):     at android.开发者_如何学Capp.ActivityThread.handleLaunchActivity(ActivityThread.java:2621)
08-21 00:07:46.624: ERROR/AndroidRuntime(12943):     at android.app.ActivityThread.access$2200(ActivityThread.java:126)
08-21 00:07:46.624: ERROR/AndroidRuntime(12943):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1932)
08-21 00:07:46.624: ERROR/AndroidRuntime(12943):     at android.os.Handler.dispatchMessage(Handler.java:99)
08-21 00:07:46.624: ERROR/AndroidRuntime(12943):     at android.os.Looper.loop(Looper.java:123)
08-21 00:07:46.624: ERROR/AndroidRuntime(12943):     at android.app.ActivityThread.main(ActivityThread.java:4595)
08-21 00:07:46.624: ERROR/AndroidRuntime(12943):     at java.lang.reflect.Method.invokeNative(Native Method)
08-21 00:07:46.624: ERROR/AndroidRuntime(12943):     at java.lang.reflect.Method.invoke(Method.java:521)
08-21 00:07:46.624: ERROR/AndroidRuntime(12943):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
08-21 00:07:46.624: ERROR/AndroidRuntime(12943):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
08-21 00:07:46.624: ERROR/AndroidRuntime(12943):     at dalvik.system.NativeStart.main(Native Method)
08-21 00:07:46.624: ERROR/AndroidRuntime(12943): Caused by: android.database.sqlite.SQLiteException: no such column: journals._id: UPDATE plants SET days = (SELECT COUNT(*) FROM plants WHERE journals._id = plants.homeid)
08-21 00:07:46.624: ERROR/AndroidRuntime(12943):     at android.database.sqlite.SQLiteDatabase.native_execSQL(Native Method)

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You're not checking the journals table! "FROM" determines what table you're looking into. You probably want to do an inner join?