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1 # 2001 September 15 |
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2 # |
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3 # The author disclaims copyright to this source code. In place of |
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4 # a legal notice, here is a blessing: |
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5 # |
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6 # May you do good and not evil. |
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7 # May you find forgiveness for yourself and forgive others. |
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8 # May you share freely, never taking more than you give. |
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9 # |
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10 #*********************************************************************** |
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11 # This file implements regression tests for SQLite library. The |
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12 # focus of this file is testing SELECT statements that are part of |
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13 # expressions. |
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14 # |
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15 # $Id: subselect.test,v 1.16 2008/08/04 03:51:24 danielk1977 Exp $ |
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16 |
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17 set testdir [file dirname $argv0] |
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18 source $testdir/tester.tcl |
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19 |
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20 # Omit this whole file if the library is build without subquery support. |
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21 ifcapable !subquery { |
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22 finish_test |
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23 return |
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24 } |
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25 |
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26 # Basic sanity checking. Try a simple subselect. |
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27 # |
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28 do_test subselect-1.1 { |
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29 execsql { |
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30 CREATE TABLE t1(a int, b int); |
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31 INSERT INTO t1 VALUES(1,2); |
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32 INSERT INTO t1 VALUES(3,4); |
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33 INSERT INTO t1 VALUES(5,6); |
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34 } |
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35 execsql {SELECT * FROM t1 WHERE a = (SELECT count(*) FROM t1)} |
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36 } {3 4} |
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37 |
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38 # Try a select with more than one result column. |
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39 # |
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40 do_test subselect-1.2 { |
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41 set v [catch {execsql {SELECT * FROM t1 WHERE a = (SELECT * FROM t1)}} msg] |
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42 lappend v $msg |
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43 } {1 {only a single result allowed for a SELECT that is part of an expression}} |
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44 |
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45 # A subselect without an aggregate. |
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46 # |
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47 do_test subselect-1.3a { |
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48 execsql {SELECT b from t1 where a = (SELECT a FROM t1 WHERE b=2)} |
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49 } {2} |
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50 do_test subselect-1.3b { |
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51 execsql {SELECT b from t1 where a = (SELECT a FROM t1 WHERE b=4)} |
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52 } {4} |
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53 do_test subselect-1.3c { |
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54 execsql {SELECT b from t1 where a = (SELECT a FROM t1 WHERE b=6)} |
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55 } {6} |
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56 do_test subselect-1.3d { |
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57 execsql {SELECT b from t1 where a = (SELECT a FROM t1 WHERE b=8)} |
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58 } {} |
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59 ifcapable compound { |
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60 do_test subselect-1.3e { |
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61 execsql { |
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62 SELECT b FROM t1 |
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63 WHERE a = (SELECT a FROM t1 UNION SELECT b FROM t1 ORDER BY 1); |
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64 } |
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65 } {2} |
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66 } |
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67 |
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68 # What if the subselect doesn't return any value. We should get |
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69 # NULL as the result. Check it out. |
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70 # |
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71 do_test subselect-1.4 { |
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72 execsql {SELECT b from t1 where a = coalesce((SELECT a FROM t1 WHERE b=5),1)} |
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73 } {2} |
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74 |
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75 # Try multiple subselects within a single expression. |
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76 # |
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77 do_test subselect-1.5 { |
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78 execsql { |
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79 CREATE TABLE t2(x int, y int); |
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80 INSERT INTO t2 VALUES(1,2); |
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81 INSERT INTO t2 VALUES(2,4); |
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82 INSERT INTO t2 VALUES(3,8); |
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83 INSERT INTO t2 VALUES(4,16); |
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84 } |
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85 execsql { |
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86 SELECT y from t2 |
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87 WHERE x = (SELECT sum(b) FROM t1 where a notnull) - (SELECT sum(a) FROM t1) |
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88 } |
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89 } {8} |
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90 |
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91 # Try something useful. Delete every entry from t2 where the |
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92 # x value is less than half of the maximum. |
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93 # |
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94 do_test subselect-1.6 { |
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95 execsql {DELETE FROM t2 WHERE x < 0.5*(SELECT max(x) FROM t2)} |
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96 execsql {SELECT x FROM t2 ORDER BY x} |
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97 } {2 3 4} |
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98 |
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99 # Make sure sorting works for SELECTs there used as a scalar expression. |
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100 # |
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101 do_test subselect-2.1 { |
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102 execsql { |
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103 SELECT (SELECT a FROM t1 ORDER BY a), (SELECT a FROM t1 ORDER BY a DESC) |
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104 } |
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105 } {1 5} |
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106 do_test subselect-2.2 { |
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107 execsql { |
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108 SELECT 1 IN (SELECT a FROM t1 ORDER BY a); |
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109 } |
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110 } {1} |
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111 do_test subselect-2.3 { |
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112 execsql { |
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113 SELECT 2 IN (SELECT a FROM t1 ORDER BY a DESC); |
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114 } |
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115 } {0} |
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116 |
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117 # Verify that the ORDER BY clause is honored in a subquery. |
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118 # |
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119 ifcapable compound { |
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120 do_test subselect-3.1 { |
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121 execsql { |
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122 CREATE TABLE t3(x int); |
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123 INSERT INTO t3 SELECT a FROM t1 UNION ALL SELECT b FROM t1; |
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124 SELECT * FROM t3 ORDER BY x; |
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125 } |
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126 } {1 2 3 4 5 6} |
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127 } ;# ifcapable compound |
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128 ifcapable !compound { |
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129 do_test subselect-3.1 { |
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130 execsql { |
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131 CREATE TABLE t3(x int); |
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132 INSERT INTO t3 SELECT a FROM t1; |
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133 INSERT INTO t3 SELECT b FROM t1; |
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134 SELECT * FROM t3 ORDER BY x; |
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135 } |
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136 } {1 2 3 4 5 6} |
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137 } ;# ifcapable !compound |
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138 |
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139 do_test subselect-3.2 { |
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140 execsql { |
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141 SELECT sum(x) FROM (SELECT x FROM t3 ORDER BY x LIMIT 2); |
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142 } |
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143 } {3} |
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144 do_test subselect-3.3 { |
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145 execsql { |
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146 SELECT sum(x) FROM (SELECT x FROM t3 ORDER BY x DESC LIMIT 2); |
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147 } |
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148 } {11} |
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149 do_test subselect-3.4 { |
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150 execsql { |
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151 SELECT (SELECT x FROM t3 ORDER BY x); |
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152 } |
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153 } {1} |
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154 do_test subselect-3.5 { |
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155 execsql { |
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156 SELECT (SELECT x FROM t3 ORDER BY x DESC); |
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157 } |
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158 } {6} |
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159 do_test subselect-3.6 { |
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160 execsql { |
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161 SELECT (SELECT x FROM t3 ORDER BY x LIMIT 1); |
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162 } |
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163 } {1} |
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164 do_test subselect-3.7 { |
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165 execsql { |
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166 SELECT (SELECT x FROM t3 ORDER BY x DESC LIMIT 1); |
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167 } |
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168 } {6} |
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169 do_test subselect-3.8 { |
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170 execsql { |
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171 SELECT (SELECT x FROM t3 ORDER BY x LIMIT 1 OFFSET 2); |
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172 } |
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173 } {3} |
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174 do_test subselect-3.9 { |
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175 execsql { |
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176 SELECT (SELECT x FROM t3 ORDER BY x DESC LIMIT 1 OFFSET 2); |
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177 } |
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178 } {4} |
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179 do_test subselect-3.10 { |
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180 execsql { |
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181 SELECT x FROM t3 WHERE x IN |
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182 (SELECT x FROM t3 ORDER BY x DESC LIMIT 1 OFFSET 2); |
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183 } |
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184 } {4} |
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185 |
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186 # Ticket #2295. |
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187 # Make sure type affinities work correctly on subqueries with |
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188 # an ORDER BY clause. |
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189 # |
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190 do_test subselect-4.1 { |
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191 execsql { |
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192 CREATE TABLE t4(a TEXT, b TEXT); |
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193 INSERT INTO t4 VALUES('a','1'); |
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194 INSERT INTO t4 VALUES('b','2'); |
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195 INSERT INTO t4 VALUES('c','3'); |
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196 SELECT a FROM t4 WHERE b IN (SELECT b FROM t4 ORDER BY b); |
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197 } |
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198 } {a b c} |
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199 do_test subselect-4.2 { |
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200 execsql { |
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201 SELECT a FROM t4 WHERE b IN (SELECT b FROM t4 ORDER BY b LIMIT 1); |
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202 } |
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203 } {a} |
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204 do_test subselect-4.3 { |
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205 execsql { |
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206 SELECT a FROM t4 WHERE b IN (SELECT b FROM t4 ORDER BY b DESC LIMIT 1); |
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207 } |
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208 } {c} |
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209 |
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210 finish_test |