Why this query PRAGMA case_sensitive_like=ON;EXPLAIN QUERY PLAN SELECT * FROM car_plates INDEXED BY car_plates_plate WHERE ((CarPlateType!=-1)AND((Plate LIKE 'AA00O%')OR(Plate LIKE 'AA0O0%')))OR((CarPlateType==-1)AND((Plate LIKE '~A00O%')))
give me "Error: no query solution" if I remove the second expression ((CarPlateType==-1)AND((Plate LIKE '~A00O%'))) it works Selea s.r.l. Michele Pradella R&D SELEA s.r.l. Via Aldo Moro 69 Italy - 46019 Cicognara (MN) Tel +39 0375 889091 Fax +39 0375 889080 *michele.pradella at selea.com* <mailto:michele.pradella at selea.com> *http://www.selea.com* Il 12/02/2016 15.02, Michele Pradella ha scritto: > the strange thing is that if you create > > CREATE TABLE car_plates (Id INTEGER PRIMARY KEY AUTOINCREMENT,DateTime > BIGINT,StringKey VARCHAR(255) UNIQUE,Plate VARCHAR(255),Type > BIGINT,CameraName VARCHAR(255),CameraIP VARCHAR(255),CameraMAC > VARCHAR(255),FileName VARCHAR(255),Country VARCHAR(255),Confidence > VARCHAR(255),Reason VARCHAR(255),CarPlateType BIGINT,VehicleType > BIGINT,GPS VARCHAR(255)); > CREATE INDEX car_plates_datetime ON car_plates(DateTime); > CREATE INDEX car_plates_plate ON car_plates(Plate); > > and you do > PRAGMA case_sensitive_like=ON; > EXPLAIN QUERY PLAN SELECT * FROM car_plates WHERE ((Plate LIKE > 'EX011%')) AND > (DateTime>=1455058800000000)AND(DateTime<=1455231599999999); > > you will see the use of car_plates_datetime not car_plates_plate, but > if you force the use of the index(car_plates_plate) it will use the > correct index > PRAGMA case_sensitive_like=ON; > EXPLAIN QUERY PLAN SELECT * FROM car_plates indexed by > car_plates_plateWHERE ((Plate LIKE 'EX011%')) AND > (DateTime>=1455058800000000)AND(DateTime<=1455231599999999) > > with PRAGMA case_sensitive_like=OFF; you obviously obtain error > > Selea s.r.l. > > > Michele Pradella R&D > > > SELEA s.r.l. > > Via Aldo Moro 69 > Italy - 46019 Cicognara (MN) > Tel +39 0375 889091 > Fax +39 0375 889080 > *michele.pradella at selea.com* <mailto:michele.pradella at selea.com> > *http://www.selea.com* > Il 12/02/2016 13.20, Richard Hipp ha scritto: >> On 2/12/16, Michele Pradella <michele.pradella at selea.com> wrote: >>> table: >>> CREATE TABLE IF NOT EXISTS car_plates (Id INTEGER PRIMARY KEY >>> AUTOINCREMENT,DateTime BIGINT,StringKey VARCHAR(255) UNIQUE,Plate >>> VARCHAR(255),Type BIGINT,CameraName VARCHAR(255),CameraIP >>> VARCHAR(255),CameraMAC VARCHAR(255),FileName VARCHAR(255),Country >>> VARCHAR(255),Confidence VARCHAR(255),Reason VARCHAR(255),CarPlateType >>> BIGINT,VehicleType BIGINT,GPS VARCHAR(255)) >>> >>> index: >>> CREATE INDEX IF NOT EXISTS car_plates_plate ON car_plates(Plate) >>> >> Test case: >> >> /* Your original schema */ >> CREATE TABLE IF NOT EXISTS car_plates (Id INTEGER PRIMARY KEY >> AUTOINCREMENT,DateTime BIGINT,StringKey VARCHAR(255) UNIQUE,Plate >> VARCHAR(255),Type BIGINT,CameraName VARCHAR(255),CameraIP >> VARCHAR(255),CameraMAC VARCHAR(255),FileName VARCHAR(255),Country >> VARCHAR(255),Confidence VARCHAR(255),Reason VARCHAR(255),CarPlateType >> BIGINT,VehicleType BIGINT,GPS VARCHAR(255)); >> CREATE INDEX IF NOT EXISTS car_plates_plate ON car_plates(Plate); >> /* Sample query with PRAGMA case_sensitive_like=OFF (the default) */ >> EXPLAIN QUERY PLAN >> SELECT >> DateTime,FileName,Plate,Type,CameraName,Id,Country,Reason,CarPlateType,VehicleType,GPS >> FROM car_plates WHERE ((Plate LIKE 'EX011%')) AND (Type IN >> (1,2,3,6,7,8)) AND (DateTime>=1455058800000000) AND >> (DateTime<=1455231599999999) ORDER BY DateTime DESC LIMIT 20000; >> .print ----- >> /* Sample Query with PRAGMA case_sensitive_like=ON */ >> PRAGMA case_sensitive_like=ON; >> EXPLAIN QUERY PLAN >> SELECT >> DateTime,FileName,Plate,Type,CameraName,Id,Country,Reason,CarPlateType,VehicleType,GPS >> FROM car_plates WHERE ((Plate LIKE 'EX011%')) AND (Type IN >> (1,2,3,6,7,8)) AND (DateTime>=1455058800000000) AND >> (DateTime<=1455231599999999) ORDER BY DateTime DESC LIMIT 20000; >> >> Run the above in the shell. See that the second query uses the index. >> >> Or, leave case_sensitive_like turned off (the default) but change the >> table definition to include: >> >> ... Plate VARCHAR(255) COLLATE nocase, ... >> >> If you add the "COLLATE nocase" to the example above, you will see >> that the index is used in the default setting, but not when PRAGMA >> case_sensitive_like=ON. >> >> > > _______________________________________________ > sqlite-users mailing list > sqlite-users at mailinglists.sqlite.org > http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users