1# 2001 November 6 2# 3# The author disclaims copyright to this source code. In place of 4# a legal notice, here is a blessing: 5# 6# May you do good and not evil. 7# May you find forgiveness for yourself and forgive others. 8# May you share freely, never taking more than you give. 9# 10#*********************************************************************** 11# This file implements regression tests for SQLite library. The 12# focus of this file is testing the LIMIT ... OFFSET ... clause 13# of SELECT statements. 14# 15# $Id: limit.test,v 1.21 2005/01/20 02:17:02 danielk1977 Exp $ 16 17set testdir [file dirname $argv0] 18source $testdir/tester.tcl 19 20# Build some test data 21# 22execsql { 23 CREATE TABLE t1(x int, y int); 24 BEGIN; 25} 26for {set i 1} {$i<=32} {incr i} { 27 for {set j 0} {pow(2,$j)<$i} {incr j} {} 28 execsql "INSERT INTO t1 VALUES([expr {32-$i}],[expr {10-$j}])" 29} 30execsql { 31 COMMIT; 32} 33 34do_test limit-1.0 { 35 execsql {SELECT count(*) FROM t1} 36} {32} 37do_test limit-1.1 { 38 execsql {SELECT count(*) FROM t1 LIMIT 5} 39} {32} 40do_test limit-1.2.1 { 41 execsql {SELECT x FROM t1 ORDER BY x LIMIT 5} 42} {0 1 2 3 4} 43do_test limit-1.2.2 { 44 execsql {SELECT x FROM t1 ORDER BY x LIMIT 5 OFFSET 2} 45} {2 3 4 5 6} 46do_test limit-1.2.3 { 47 execsql {SELECT x FROM t1 ORDER BY x LIMIT 2, 5} 48} {2 3 4 5 6} 49do_test limit-1.3 { 50 execsql {SELECT x FROM t1 ORDER BY x LIMIT 5 OFFSET 5} 51} {5 6 7 8 9} 52do_test limit-1.4.1 { 53 execsql {SELECT x FROM t1 ORDER BY x LIMIT 50 OFFSET 30} 54} {30 31} 55do_test limit-1.4.2 { 56 execsql {SELECT x FROM t1 ORDER BY x LIMIT 30, 50} 57} {30 31} 58do_test limit-1.5 { 59 execsql {SELECT x FROM t1 ORDER BY x LIMIT 50 OFFSET 50} 60} {} 61do_test limit-1.6 { 62 execsql {SELECT * FROM t1 AS a, t1 AS b ORDER BY a.x, b.x LIMIT 5} 63} {0 5 0 5 0 5 1 5 0 5 2 5 0 5 3 5 0 5 4 5} 64do_test limit-1.7 { 65 execsql {SELECT * FROM t1 AS a, t1 AS b ORDER BY a.x, b.x LIMIT 5 OFFSET 32} 66} {1 5 0 5 1 5 1 5 1 5 2 5 1 5 3 5 1 5 4 5} 67 68ifcapable view { 69do_test limit-2.1 { 70 execsql { 71 CREATE VIEW v1 AS SELECT * FROM t1 LIMIT 2; 72 SELECT count(*) FROM (SELECT * FROM v1); 73 } 74} 2 75} ;# ifcapable view 76do_test limit-2.2 { 77 execsql { 78 CREATE TABLE t2 AS SELECT * FROM t1 LIMIT 2; 79 SELECT count(*) FROM t2; 80 } 81} 2 82do_test limit-2.3 { 83 execsql { 84 SELECT count(*) FROM t1 WHERE rowid IN (SELECT rowid FROM t1 LIMIT 2); 85 } 86} 2 87 88do_test limit-3.1 { 89 execsql { 90 SELECT z FROM (SELECT y*10+x AS z FROM t1 ORDER BY x LIMIT 10) 91 ORDER BY z LIMIT 5; 92 } 93} {50 51 52 53 54} 94 95do_test limit-4.1 { 96 execsql { 97 BEGIN; 98 CREATE TABLE t3(x); 99 INSERT INTO t3 SELECT x FROM t1 ORDER BY x LIMIT 10 OFFSET 1; 100 INSERT INTO t3 SELECT x+(SELECT max(x) FROM t3) FROM t3; 101 INSERT INTO t3 SELECT x+(SELECT max(x) FROM t3) FROM t3; 102 INSERT INTO t3 SELECT x+(SELECT max(x) FROM t3) FROM t3; 103 INSERT INTO t3 SELECT x+(SELECT max(x) FROM t3) FROM t3; 104 INSERT INTO t3 SELECT x+(SELECT max(x) FROM t3) FROM t3; 105 INSERT INTO t3 SELECT x+(SELECT max(x) FROM t3) FROM t3; 106 INSERT INTO t3 SELECT x+(SELECT max(x) FROM t3) FROM t3; 107 INSERT INTO t3 SELECT x+(SELECT max(x) FROM t3) FROM t3; 108 INSERT INTO t3 SELECT x+(SELECT max(x) FROM t3) FROM t3; 109 INSERT INTO t3 SELECT x+(SELECT max(x) FROM t3) FROM t3; 110 END; 111 SELECT count(*) FROM t3; 112 } 113} {10240} 114do_test limit-4.2 { 115 execsql { 116 SELECT x FROM t3 LIMIT 2 OFFSET 10000 117 } 118} {10001 10002} 119do_test limit-4.3 { 120 execsql { 121 CREATE TABLE t4 AS SELECT x, 122 'abcdefghijklmnopqrstuvwyxz ABCDEFGHIJKLMNOPQRSTUVWYXZ' || x || 123 'abcdefghijklmnopqrstuvwyxz ABCDEFGHIJKLMNOPQRSTUVWYXZ' || x || 124 'abcdefghijklmnopqrstuvwyxz ABCDEFGHIJKLMNOPQRSTUVWYXZ' || x || 125 'abcdefghijklmnopqrstuvwyxz ABCDEFGHIJKLMNOPQRSTUVWYXZ' || x || 126 'abcdefghijklmnopqrstuvwyxz ABCDEFGHIJKLMNOPQRSTUVWYXZ' || x AS y 127 FROM t3 LIMIT 1000; 128 SELECT x FROM t4 ORDER BY y DESC LIMIT 1 OFFSET 999; 129 } 130} {1000} 131 132do_test limit-5.1 { 133 execsql { 134 CREATE TABLE t5(x,y); 135 INSERT INTO t5 SELECT x-y, x+y FROM t1 WHERE x BETWEEN 10 AND 15 136 ORDER BY x LIMIT 2; 137 SELECT * FROM t5 ORDER BY x; 138 } 139} {5 15 6 16} 140do_test limit-5.2 { 141 execsql { 142 DELETE FROM t5; 143 INSERT INTO t5 SELECT x-y, x+y FROM t1 WHERE x BETWEEN 10 AND 15 144 ORDER BY x DESC LIMIT 2; 145 SELECT * FROM t5 ORDER BY x; 146 } 147} {9 19 10 20} 148do_test limit-5.3 { 149 execsql { 150 DELETE FROM t5; 151 INSERT INTO t5 SELECT x-y, x+y FROM t1 WHERE x ORDER BY x DESC LIMIT 31; 152 SELECT * FROM t5 ORDER BY x LIMIT 2; 153 } 154} {-4 6 -3 7} 155do_test limit-5.4 { 156 execsql { 157 SELECT * FROM t5 ORDER BY x DESC, y DESC LIMIT 2; 158 } 159} {21 41 21 39} 160do_test limit-5.5 { 161 execsql { 162 DELETE FROM t5; 163 INSERT INTO t5 SELECT a.x*100+b.x, a.y*100+b.y FROM t1 AS a, t1 AS b 164 ORDER BY 1, 2 LIMIT 1000; 165 SELECT count(*), sum(x), sum(y), min(x), max(x), min(y), max(y) FROM t5; 166 } 167} {1000 1528204.0 593161.0 0 3107 505 1005} 168 169# There is some contraversy about whether LIMIT 0 should be the same as 170# no limit at all or if LIMIT 0 should result in zero output rows. 171# 172do_test limit-6.1 { 173 execsql { 174 BEGIN; 175 CREATE TABLE t6(a); 176 INSERT INTO t6 VALUES(1); 177 INSERT INTO t6 VALUES(2); 178 INSERT INTO t6 SELECT a+2 FROM t6; 179 COMMIT; 180 SELECT * FROM t6; 181 } 182} {1 2 3 4} 183do_test limit-6.2 { 184 execsql { 185 SELECT * FROM t6 LIMIT -1 OFFSET -1; 186 } 187} {1 2 3 4} 188do_test limit-6.3 { 189 execsql { 190 SELECT * FROM t6 LIMIT 2 OFFSET -123; 191 } 192} {1 2} 193do_test limit-6.4 { 194 execsql { 195 SELECT * FROM t6 LIMIT -432 OFFSET 2; 196 } 197} {3 4} 198do_test limit-6.5 { 199 execsql { 200 SELECT * FROM t6 LIMIT -1 201 } 202} {1 2 3 4} 203do_test limit-6.6 { 204 execsql { 205 SELECT * FROM t6 LIMIT -1 OFFSET 1 206 } 207} {2 3 4} 208do_test limit-6.7 { 209 execsql { 210 SELECT * FROM t6 LIMIT 0 211 } 212} {} 213do_test limit-6.8 { 214 execsql { 215 SELECT * FROM t6 LIMIT 0 OFFSET 1 216 } 217} {} 218 219# Make sure LIMIT works well with compound SELECT statements. 220# Ticket #393 221# 222ifcapable compound { 223do_test limit-7.1.1 { 224 catchsql { 225 SELECT x FROM t2 LIMIT 5 UNION ALL SELECT a FROM t6; 226 } 227} {1 {LIMIT clause should come after UNION ALL not before}} 228do_test limit-7.1.2 { 229 catchsql { 230 SELECT x FROM t2 LIMIT 5 UNION SELECT a FROM t6; 231 } 232} {1 {LIMIT clause should come after UNION not before}} 233do_test limit-7.1.3 { 234 catchsql { 235 SELECT x FROM t2 LIMIT 5 EXCEPT SELECT a FROM t6 LIMIT 3; 236 } 237} {1 {LIMIT clause should come after EXCEPT not before}} 238do_test limit-7.1.4 { 239 catchsql { 240 SELECT x FROM t2 LIMIT 0,5 INTERSECT SELECT a FROM t6; 241 } 242} {1 {LIMIT clause should come after INTERSECT not before}} 243do_test limit-7.2 { 244 execsql { 245 SELECT x FROM t2 UNION ALL SELECT a FROM t6 LIMIT 5; 246 } 247} {31 30 1 2 3} 248do_test limit-7.3 { 249 execsql { 250 SELECT x FROM t2 UNION ALL SELECT a FROM t6 LIMIT 3 OFFSET 1; 251 } 252} {30 1 2} 253do_test limit-7.4 { 254 execsql { 255 SELECT x FROM t2 UNION ALL SELECT a FROM t6 ORDER BY 1 LIMIT 3 OFFSET 1; 256 } 257} {2 3 4} 258do_test limit-7.5 { 259 execsql { 260 SELECT x FROM t2 UNION SELECT x+2 FROM t2 LIMIT 2 OFFSET 1; 261 } 262} {31 32} 263do_test limit-7.6 { 264 execsql { 265 SELECT x FROM t2 UNION SELECT x+2 FROM t2 ORDER BY 1 DESC LIMIT 2 OFFSET 1; 266 } 267} {32 31} 268do_test limit-7.7 { 269 execsql { 270 SELECT a+9 FROM t6 EXCEPT SELECT y FROM t2 LIMIT 2; 271 } 272} {11 12} 273do_test limit-7.8 { 274 execsql { 275 SELECT a+9 FROM t6 EXCEPT SELECT y FROM t2 ORDER BY 1 DESC LIMIT 2; 276 } 277} {13 12} 278do_test limit-7.9 { 279 execsql { 280 SELECT a+26 FROM t6 INTERSECT SELECT x FROM t2 LIMIT 1; 281 } 282} {30} 283do_test limit-7.10 { 284 execsql { 285 SELECT a+27 FROM t6 INTERSECT SELECT x FROM t2 LIMIT 1; 286 } 287} {30} 288do_test limit-7.11 { 289 execsql { 290 SELECT a+27 FROM t6 INTERSECT SELECT x FROM t2 LIMIT 1 OFFSET 1; 291 } 292} {31} 293do_test limit-7.12 { 294 execsql { 295 SELECT a+27 FROM t6 INTERSECT SELECT x FROM t2 296 ORDER BY 1 DESC LIMIT 1 OFFSET 1; 297 } 298} {30} 299} ;# ifcapable compound 300 301# Tests for limit in conjunction with distinct. The distinct should 302# occur before both the limit and the offset. Ticket #749. 303# 304do_test limit-8.1 { 305 execsql { 306 SELECT DISTINCT round(x/100) FROM t3 LIMIT 5; 307 } 308} {0 1 2 3 4} 309do_test limit-8.2 { 310 execsql { 311 SELECT DISTINCT round(x/100) FROM t3 LIMIT 5 OFFSET 5; 312 } 313} {5 6 7 8 9} 314do_test limit-8.3 { 315 execsql { 316 SELECT DISTINCT round(x/100) FROM t3 LIMIT 5 OFFSET 25; 317 } 318} {25 26 27 28 29} 319 320# Make sure limits on multiple subqueries work correctly. 321# Ticket #1035 322# 323do_test limit-9.1 { 324 execsql { 325 SELECT * FROM (SELECT * FROM t6 LIMIT 3); 326 } 327} {1 2 3} 328do_test limit-9.2 { 329 execsql { 330 CREATE TABLE t7 AS SELECT * FROM t6; 331 SELECT * FROM (SELECT * FROM t7 LIMIT 3); 332 } 333} {1 2 3} 334ifcapable compound { 335 do_test limit-9.3 { 336 execsql { 337 SELECT * FROM (SELECT * FROM t6 LIMIT 3) 338 UNION 339 SELECT * FROM (SELECT * FROM t7 LIMIT 3) 340 ORDER BY 1 341 } 342 } {1 2 3} 343 do_test limit-9.4 { 344 execsql { 345 SELECT * FROM (SELECT * FROM t6 LIMIT 3) 346 UNION 347 SELECT * FROM (SELECT * FROM t7 LIMIT 3) 348 ORDER BY 1 349 LIMIT 2 350 } 351 } {1 2} 352 do_test limit-9.5 { 353 catchsql { 354 SELECT * FROM t6 LIMIT 3 355 UNION 356 SELECT * FROM t7 LIMIT 3 357 } 358 } {1 {LIMIT clause should come after UNION not before}} 359} 360 361finish_test 362