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Sort-merge join

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50:), or by taking advantage of a pre-existing ordering in one or both of the join relations. The latter condition, called interesting order, can occur because an input to the join might be produced by an index scan of a tree-based index, another merge join, or some other plan operator that happens to produce output sorted on an appropriate key. Interesting orders need not be serendipitous: the optimizer may seek out this possibility and choose a plan that is suboptimal for a specific preceding operation if it yields an interesting order that one or more downstream nodes can exploit. 1403:
Since the comparison logic is not the central aspect of this algorithm, it is hidden behind a generic comparator and can also consist of several comparison criteria (e.g. multiple columns). The compare function should return if a row is
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in each relation which display that value. The key idea of the sort-merge algorithm is to first sort the relations by the join attribute, so that interleaved linear scans will encounter these sets at the same time.
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In practice, the most expensive part of performing a sort-merge join is arranging for both inputs to the algorithm to be presented in sorted order. This can be achieved via an explicit sort operation (often an
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Note that this implementation assumes the join attributes are unique, i.e., there is no need to output multiple tuples for a given value of the key.
334: 571:. Generalization to other join types is straightforward. The output of the algorithm will contain only rows contained in the 453: 2378: 37:
The basic problem of a join algorithm is to find, for each distinct value of the join attribute, the set of
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are not ordered the worst case time cost will contain additional terms of sorting time:
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Note that a relation in terms of this pseudocode supports some basic operations:
24: 2386: 47: 2327: 443:{\displaystyle O(P_{r}+P_{s}+P_{r}\log(P_{r})+P_{s}\log(P_{s}))} 1038:// Mark position of left row and keep copy of current left row 559:
For simplicity, the algorithm is described in the case of an
38: 1491:// Returns true if relation has a next row (otherwise false) 1563:// Restores the current row index to the marked row index 456: 337: 317: 297: 248: 217: 197: 170: 150: 104: 84: 64: 536:{\displaystyle O(P_{r}\log(P_{r})+P_{s}\log(P_{s}))} 535: 442: 323: 303: 283: 230: 203: 183: 156: 136: 90: 70: 2384: 1605:// Assume that left and right are already sorted 1506:// Returns the next row of the relation (if any) 1521:// Sorts the relation with the given comparator 1469:// Return 1 if leftRow is greater than rightRow 714:// Sort left and right relation with comparator 660:// Ensure that at least one element is present 2379:C# Implementations of Various Join Algorithms 1463:// Return -1 if leftRow is less than rightRow 1583: 1466:// Return 0 if leftRow is equal to rightRow 549:Big O notation – Orders of common functions 27:and is used in the implementation of a 2385: 16:Algorithm used in relational databases 969:// Left row is greater than right row 547:terms outweigh the linear terms, see 1374:// Continue with outer forever loop 1191:// Continue with inner forever loop 1119:// Left row and right row are equal 238:pages memory. In the worst case, a 13: 897:// Left row is less than right row 14: 2404: 2373: 291:I/O operations. In the case that 23:(also known as merge join) is a 1836:// if (left.Key > right.Key) 579:relation and duplicates form a 2345: 1548:// Marks the current row index 1305:// Restore left to stored mark 530: 527: 514: 492: 479: 460: 437: 434: 421: 399: 386: 341: 284:{\displaystyle O(P_{r}+P_{s})} 278: 252: 130: 122: 114: 106: 1: 2338: 753:// Start Merge Join algorithm 554: 53: 1224:// Advance to next right row 993:// Advance to next right row 7: 2321: 1338:// Check if left row exists 1170:// Check if left row exists 1149:// Advance to next left row 921:// Advance to next left row 10: 2409: 137:{\displaystyle |R|<|S|} 32:database management system 1590: 1584:Simple C# implementation 1479: 1418: 585: 537: 444: 325: 305: 285: 232: 205: 185: 158: 138: 92: 72: 1122:// Add rows to result 538: 445: 326: 306: 286: 233: 231:{\displaystyle P_{s}} 206: 186: 184:{\displaystyle P_{r}} 159: 139: 93: 73: 454: 335: 315: 295: 246: 215: 195: 168: 148: 102: 82: 62: 98:be relations where 2353:"Sort-Merge Joins" 1416:than another row: 533: 440: 321: 301: 281: 228: 201: 181: 154: 134: 88: 68: 581:Cartesian product 563:of two relations 324:{\displaystyle S} 304:{\displaystyle R} 204:{\displaystyle S} 191:pages memory and 157:{\displaystyle R} 91:{\displaystyle S} 71:{\displaystyle R} 2400: 2367: 2366: 2364: 2363: 2357:www.dcs.ed.ac.uk 2349: 2333:Nested loop join 2317: 2314: 2311: 2308: 2305: 2302: 2299: 2296: 2293: 2290: 2287: 2284: 2281: 2278: 2275: 2272: 2269: 2266: 2263: 2260: 2257: 2254: 2251: 2248: 2245: 2242: 2239: 2236: 2233: 2230: 2227: 2224: 2221: 2218: 2215: 2212: 2209: 2206: 2203: 2200: 2197: 2194: 2191: 2188: 2185: 2182: 2179: 2176: 2173: 2170: 2167: 2164: 2161: 2158: 2155: 2152: 2149: 2146: 2143: 2140: 2137: 2134: 2131: 2128: 2125: 2122: 2119: 2116: 2113: 2110: 2107: 2104: 2101: 2098: 2095: 2092: 2089: 2086: 2083: 2080: 2077: 2074: 2071: 2068: 2065: 2062: 2059: 2056: 2053: 2050: 2047: 2044: 2041: 2038: 2035: 2032: 2029: 2026: 2023: 2020: 2017: 2014: 2011: 2008: 2005: 2002: 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2375: 2374:External links 2372: 2369: 2368: 2343: 2342: 2340: 2337: 2336: 2335: 2330: 2323: 2320: 1591: 1585: 1582: 1480: 1419: 586: 556: 553: 532: 529: 524: 520: 516: 513: 510: 505: 501: 497: 494: 489: 485: 481: 478: 475: 470: 466: 462: 459: 439: 436: 431: 427: 423: 420: 417: 412: 408: 404: 401: 396: 392: 388: 385: 382: 377: 373: 369: 364: 360: 356: 351: 347: 343: 340: 320: 300: 280: 275: 271: 267: 262: 258: 254: 251: 225: 221: 200: 178: 174: 153: 132: 128: 124: 120: 116: 112: 108: 87: 67: 55: 52: 25:join algorithm 15: 9: 6: 4: 3: 2: 2405: 2394: 2391: 2390: 2388: 2381: 2380: 2358: 2354: 2348: 2344: 2334: 2331: 2329: 2326: 2325: 1589: 1478: 1417: 1415: 1411: 1407: 1326:markedLeftRow 1281:markedLeftRow 1053:markedLeftRow 584: 582: 578: 574: 570: 566: 562: 552: 550: 546: 522: 518: 511: 508: 503: 499: 495: 487: 483: 476: 473: 468: 464: 457: 429: 425: 418: 415: 410: 406: 402: 394: 390: 383: 380: 375: 371: 367: 362: 358: 354: 349: 345: 338: 318: 298: 273: 269: 265: 260: 256: 249: 241: 223: 219: 198: 176: 172: 151: 126: 118: 110: 85: 65: 51: 49: 48:external sort 43: 40: 35: 33: 30: 26: 22: 2377: 2360:. Retrieved 2356: 2347: 1587: 1476: 1413: 1409: 1405: 1402: 576: 572: 568: 564: 558: 545:linearithmic 242:will run in 239: 57: 44: 36: 20: 18: 1566:restoreMark 1518:RelationRow 1448:RelationRow 1436:RelationRow 1314:restoreMark 2362:2022-11-02 2339:References 1683:&& 1536:Comparator 1530:comparator 1269:comparator 1083:comparator 861:comparator 819:comparator 747:comparator 729:comparator 636:Comparator 630:comparator 561:inner join 555:Pseudocode 54:Complexity 29:relational 2328:Hash join 2205:WriteLine 2136:IsPastEnd 1695:IsPastEnd 1677:IsPastEnd 1599:MergeJoin 1482:interface 1414:bigger(1) 512:⁡ 477:⁡ 419:⁡ 384:⁡ 2387:Category 2322:See also 2274:Relation 2223:Relation 2148:position 2064:position 2040:position 2025:position 2001:position 1956:position 1950:Position 1932:position 1875:Relation 1656:Relation 1644:Relation 1632:Relation 1623:Relation 1614:Relation 1485:Relation 1442:rightRow 1421:function 1410:equal(0) 1406:less(-1) 1287:rightRow 1227:rightRow 1143:rightRow 1101:rightRow 996:rightRow 879:rightRow 837:rightRow 774:rightRow 654:Relation 624:Relation 612:Relation 588:function 211:fits in 164:fits in 2199:Console 2178:foreach 1986:Advance 1881:private 1845:Advance 1827:Advance 1779:Advance 1767:Advance 1503:boolean 1494:hasNext 1430:leftRow 1424:compare 1350:leftRow 1320:leftRow 1275:compare 1215:hasNext 1182:leftRow 1152:leftRow 1137:leftRow 1095:leftRow 1089:compare 1059:leftRow 984:hasNext 924:leftRow 912:hasNext 873:leftRow 867:compare 831:leftRow 825:compare 756:leftRow 696:hasNext 678:hasNext 2271:public 2220:public 2163:public 2154:ENDPOS 2145:return 2130:public 2085:public 2073:return 2052:return 2046:ENDPOS 2031:ENDPOS 1980:public 1962:public 1944:public 1926:public 1911:ENDPOS 1902:public 1869:public 1857:output 1854:return 1737:output 1647:output 1611:static 1608:public 1593:public 1457:number 1395:result 1392:return 1125:result 708:result 705:return 645:result 39:tuples 2169:Print 2055:false 2013:Count 1971:=> 1953:=> 1905:const 1872:class 1839:right 1809:right 1773:right 1722:right 1689:right 1662:while 1635:right 1617:Merge 1596:class 1377:break 1359:break 1254:break 1233:right 1209:right 1194:break 1077:while 1062:while 1023:break 1002:right 978:right 951:break 813:while 798:while 780:right 735:right 690:right 618:right 597:Merge 577:right 569:right 2307:> 2301:< 2298:List 2289:list 2283:this 2262:list 2256:list 2250:this 2241:list 2238:> 2232:< 2229:List 2193:list 2166:void 2133:bool 2109:list 2088:void 2076:true 2007:list 1983:bool 1974:list 1896:list 1893:> 1887:< 1884:List 1833:else 1821:left 1806:< 1797:left 1788:else 1761:left 1749:left 1710:left 1671:left 1626:left 1575:void 1560:void 1551:mark 1545:void 1524:sort 1509:next 1368:else 1332:else 1308:left 1248:else 1239:next 1164:next 1158:left 1068:true 1047:mark 1041:left 1017:else 1008:next 963:else 945:else 936:next 930:left 906:left 885:< 804:true 786:next 768:next 762:left 741:sort 723:sort 717:left 672:left 606:left 600:Join 591:Sort 575:and 573:left 567:and 565:left 543:(as 311:and 119:< 78:and 58:Let 19:The 2310:(); 2304:int 2295:new 2235:int 2211:key 2187:key 2184:int 2121:key 2115:Add 2100:key 2097:int 2091:Add 1968:Key 1965:int 1947:int 1929:int 1908:int 1890:int 1848:(); 1830:(); 1815:Key 1803:Key 1782:(); 1770:(); 1755:Key 1743:Add 1728:Key 1716:Key 1698:()) 1659:(); 1653:new 1412:or 1218:()) 1131:add 987:()) 915:()) 699:()) 651:new 551:). 509:log 474:log 416:log 381:log 2389:: 2355:. 2277:() 2214:); 2190:in 2172:() 2151:== 2139:() 2124:); 2067:++ 2028:== 2022:|| 2004:== 1995:if 1989:() 1791:if 1758:); 1719:== 1704:if 1680:() 1569:() 1554:() 1512:() 1497:() 1408:, 1341:if 1317:() 1293:== 1263:if 1242:() 1203:if 1173:if 1167:() 1107:== 1050:() 1011:() 972:if 939:() 900:if 855:if 843:!= 789:() 771:() 684:|| 681:() 663:if 657:() 583:. 144:. 34:. 2365:. 2316:} 2313:} 2292:= 2286:. 2280:{ 2268:} 2265:; 2259:= 2253:. 2247:{ 2244:) 2226:( 2217:} 2208:( 2202:. 2196:) 2181:( 2175:{ 2160:} 2157:; 2142:{ 2127:} 2118:( 2112:. 2106:{ 2103:) 2094:( 2082:} 2079:; 2070:; 2061:} 2058:; 2049:; 2043:= 2037:{ 2034:) 2019:1 2016:- 2010:. 1998:( 1992:{ 1977:; 1959:; 1941:; 1938:0 1935:= 1923:; 1920:1 1917:- 1914:= 1899:; 1878:{ 1866:} 1863:} 1860:; 1851:} 1842:. 1824:. 1818:) 1812:. 1800:. 1794:( 1785:} 1776:. 1764:. 1752:. 1746:( 1740:. 1734:{ 1731:) 1725:. 1713:. 1707:( 1701:{ 1692:. 1686:! 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Index

join algorithm
relational
database management system
tuples
external sort
linearithmic
Big O notation – Orders of common functions
inner join
Cartesian product
Hash join
Nested loop join
"Sort-Merge Joins"
C# Implementations of Various Join Algorithms
Category
Join algorithms

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