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Let's say you have the following table (the column of interest here is cid ): +-----+-------+-------+-------+---------------------+--------------+ | cid | pid | rid | clink | time | snippet | +-----+-------+-------+-------+---------------------+--------------+ | 155 | 11222 | 1499 | 1137 | 2012-08-22 03:05:06 | hi | | 138 | 11222 | 241 | 1136 | 2012-08-21 05:25:00 | again | | 138 | 11222 | 241 | 1135 | 2012-08-21 05:16:40 | hi | | 155 | 11222 | 1499 | 1134 | 2012-08-21 05:11:00 | hi cute | | 140 | 11222 | 11223 | 1133 | 2012-08-21 05:05:18 | hi | | 154 | 11222 | 565 | 1132 | 2012-08-21 05:04:47 | 7 | | 153 | 11222 | 272 | 1131 | 2012-08-21 05:04:41 | 6 | | 146 | 11222 | 362 | 1130 | 2012-08-21 05:04:33 | 5 | | 152 | 11222 | 364 | 1129 | 2012-08-21 05:04:27 | 4 | | 151 | 11222 | 390 | 1128 | 2012-08-21 05:04:22 | 3 | | 150 | 11222 | 333 | 1127 | 2012-08-21 05:04:16 | 2 | | 148 | 11222 | 268 | 1126 | 2012-08-21 05:04:10 | 1 | | 140 | 11222 | 11223 | 1125 | 2012-08-21 04:59:57 | hi sir | | 147 | 11222 | 283 | 1123 | 2012-08-21 03:29:55 | yo | | 140 | 11222 | 11223 | 1121 | 2012-08-21 02:12:13 | hello! | | 139 | 11222 | 249 | 1120 | 2012-08-21 02:11:53 | hi :) | | 140 | 11222 | 11223 | 1119 | 2012-08-21 02:11:26 | hi :) | | 140 | 11222 | 11223 | 1118 | 2012-08-21 02:11:08 | hi too | | 139 | 11222 | 249 | 1117 | 2012-08-21 02:11:00 | :P | | 139 | 11222 | 249 | 1116 | 2012-08-21 02:10:57 | hi | | 139 | 11222 | 249 | 1115 | 2012-08-21 02:10:51 | helo | | 139 | 11222 | 249 | 1114 | 2012-08-21 02:06:19 | hi | | 139 | 11222 | 249 | 1113 | 2012-08-21 02:05:45 | hi baby | | 139 | 11222 | 249 | 1112 | 2012-08-21 02:05:00 | hi | | 139 | 11222 | 249 | 111

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