把字段为null变成指定连续的数据 论坛问题处理
原论坛贴子地址：点击打开链接
/********************************************************************************
*主题： SQl 2008/2005 论坛问题解答
*说明：本文是个人学习的一些笔记和个人愚见
* 有很多地方你可能觉得有异议，欢迎一起讨论
*作者：Stephenzhou(阿蒙)
*日期: 2012.08.7
*Mail:[email protected]
*另外：转载请著名出处。
**********************************************************************************/
--字段A有空也有带数值的
--如何把空值的部分加上数值
--要求
--1、不能重复
--2、按2000000000001起增加，2000000000002，2000000000003....
--3、效率要高，因为字段A可能有十万行数据。
--4、执行语句遇到死机等特殊情况时，能否对数据库避免产生影响。
--SQL2005 谢谢！
--输入测试数据
use DBText
go
if OBJECT_ID('tb_test') is not null
drop table tb_test
go
create table tb_test(id int identity primary key,A varchar(50))
go
declare @i int;
set @i=0;
while @i<300
begin
if right (DATEPART(ms,GETDATE()),1)=0
insert into tb_test values('test'+cast(@i as varchar));
else
insert into tb_test values(null);
set @i=@i+1
end
go
--查看测试数据
select * from tb_test
/*
id A
----------- --------------------------------------------------
1 test0
2 test1
3 test2
4 test3
5 test4
6 test5
7 NULL
8 NULL
9 NULL
10 NULL
11 NULL
12 NULL
13 NULL
14 NULL
15 NULL
16 NULL
17 NULL
18 NULL
19 NULL
20 NULL
21 NULL
22 NULL
23 NULL
24 NULL
25 test24
26 test25
27 test26
28 test27
29 test28
30 test29
31 test30
32 test31
33 test32
34 test33
35 test34
36 test35
37 test36
38 test37
39 test38
40 test39
41 test40
42 test41
43 test42
44 test43
45 test44
46 test45
47 test46
48 test47
49 test48
50 NULL
51 NULL
52 NULL
53 NULL
54 NULL
55 NULL
56 NULL
57 NULL
58 NULL
59 NULL
60 NULL
61 NULL
62 NULL
63 NULL
64 NULL
65 NULL
66 NULL
67 NULL
68 test67
...
.........
*/
--按照LZ说的情况更新
declare @str varchar(50)
set @str='2000000000000'
update tb_test set A=m.Ae from
(
select t.id as id ,t.A as A ,f.id as fid ,f.A as fA ,f.Ae as Ae from tb_test t left join (
select * ,Ae=(left(@str,len(@str)-LEN(s.rn))+CAST(s.rn as varchar)) from
( select * ,ROW_NUMBER()over(partition by A order by id) as rn from tb_test where A is null )s )f on f.id=t.id)m
where tb_test.A is null and tb_test.id=m.id
---输出更新后的结果集合
select * from tb_test
/*
id A
----------- --------------------------------------------------
1 test0
2 test1
3 test2
4 test3
5 test4
6 test5
7 2000000000001
8 2000000000002
9 2000000000003
10 2000000000004
11 2000000000005
12 2000000000006
13 2000000000007
14 2000000000008
15 2000000000009
16 2000000000010
17 2000000000011
18 2000000000012
19 2000000000013
20 2000000000014
21 2000000000015
22 2000000000016
23 2000000000017
24 2000000000018
25 test24
26 test25
27 test26
28 test27
29 test28
30 test29
31 test30
32 test31
33 test32
34 test33
35 test34
36 test35
37 test36
38 test37
39 test38
40 test39
41 test40
42 test41
43 test42
44 test43
45 test44
46 test45
47 test46
48 test47
49 test48
50 2000000000019
51 2000000000020
52 2000000000021
53 2000000000022
54 2000000000023
55 2000000000024
56 2000000000025
57 2000000000026
58 2000000000027
59 2000000000028
60 2000000000029
61 2000000000030
62 2000000000031
63 2000000000032
64 2000000000033
65 2000000000034
66 2000000000035
67 2000000000036
68 test67
69 test68
70 test69
71 test70
72 test71
73 test72
74 test73
75 test74
76 test75
77 test76
78 test77
79 test78
80 test79
81 test80
82 test81
83 test82
84 test83
85 test84
86 test85
87 test86
88 test87
89 test88
90 test89
91 test90
92 test91
93 test92
94 test93
95 test94
96 test95
97 test96
98 2000000000037
99 2000000000038
100 2000000000039
101 2000000000040
102 2000000000041
103 2000000000042
104 2000000000043
105 2000000000044
106 2000000000045
107 2000000000046
108 2000000000047
109 2000000000048
110 2000000000049
111 2000000000050
112 2000000000051
113 2000000000052
114 2000000000053
115 2000000000054
116 2000000000055
117 2000000000056
118 2000000000057
119 2000000000058
120 2000000000059
121 2000000000060
122 2000000000061
123 test122
124 test123
125 test124
126 test125
127 test126
128 test127
129 test128
130 test129
131 test130
132 test131
133 test132
134 test133
135 test134
136 test135
137 test136
138 test137
139 test138
140 test139
141 test140
142 test141
143 test142
144 test143
145 2000000000062
146 2000000000063
147 2000000000064
148 2000000000065
149 2000000000066
150 2000000000067
151 2000000000068
152 2000000000069
153 2000000000070
154 2000000000071
155 2000000000072
156 2000000000073
157 2000000000074
158 2000000000075
159 2000000000076
160 2000000000077
161 2000000000078
162 2000000000079
163 2000000000080
164 2000000000081
165 2000000000082
166 2000000000083
167 2000000000084
168 2000000000085
169 2000000000086
170 test169
171 test170
172 test171
173 test172
174 test173
175 test174
176 test175
177 test176
178 test177
179 test178
180 test179
181 test180
182 test181
183 test182
184 test183
185 test184
186 test185
187 test186
188 test187
189 test188
190 test189
191 test190
192 test191
193 test192
194 test193
195 2000000000087
196 2000000000088
197 2000000000089
198 2000000000090
199 2000000000091
200 2000000000092
201 2000000000093
202 2000000000094
203 2000000000095
204 2000000000096
205 2000000000097
206 2000000000098
207 2000000000099
208 2000000000100
209 2000000000101
210 2000000000102
211 2000000000103
212 2000000000104
213 2000000000105
214 2000000000106
215 2000000000107
216 2000000000108
217 2000000000109
218 2000000000110
219 2000000000111
220 2000000000112
221 2000000000113
222 2000000000114
223 2000000000115
224 2000000000116
225 2000000000117
226 2000000000118
227 2000000000119
228 2000000000120
229 2000000000121
230 2000000000122
231 2000000000123
232 2000000000124
233 2000000000125
234 2000000000126
235 2000000000127
236 2000000000128
237 2000000000129
238 2000000000130
239 2000000000131
240 2000000000132
241 2000000000133
242 2000000000134
243 2000000000135
244 2000000000136
245 2000000000137
246 2000000000138
247 2000000000139
248 2000000000140
249 2000000000141
250 2000000000142
251 2000000000143
252 2000000000144
253 2000000000145
254 2000000000146
255 test254
256 test255
257 test256
258 test257
259 test258
260 test259
261 test260
262 test261
263 test262
264 test263
265 test264
266 test265
267 test266
268 test267
269 test268
270 test269
271 test270
272 test271
273 test272
274 test273
275 test274
276 test275
277 test276
278 test277
279 test278
280 test279
281 test280
282 test281
283 test282
284 test283
285 test284
286 test285
287 test286
288 test287
289 test288
290 test289
291 test290
292 test291
293 test292
294 test293
295 test294
296 test295
297 test296
298 test297
299 test298
300 test299
(300 行受影响)
*/
*作者：Stephenzhou(阿蒙)
*日期: 2012.08.6
*Mail:[email protected]
*另外：转载请著名出处。
*博客地址：http://blog.csdn.net/szstephenzhou