SELECT查詢切斷字段？

我的查詢是：SELECT查詢切斷字段？

SELECT close FROM stocks WHERE the_date = '2013-04-10' AND ticker = 'JCP';

我得到一個空集。自從我意識到問題在於股票領域，因爲只使用日期就沒有問題。

所以我做

SELECT * FROM stocks; 
+----------+------------+--------+--------+--------+--------+-----------+-----------+--------+ 
| stock_ID | the_date | open | high | low | close | volume | adj_close | ticker | 
+----------+------------+--------+--------+--------+--------+-----------+-----------+--------+ 
| 1 | 2013-04-26 | 409.81 | 418.77 | 408.25 | 417.20 | 27289200 | 417.20 | AAPL 
| 2 | 2013-04-25 | 411.23 | 413.94 | 407.00 | 408.38 | 13713700 | 408.38 | AAPL 
| 3 | 2013-04-24 | 393.54 | 415.25 | 392.50 | 405.46 | 34630400 | 405.46 | AAPL 
| 4 | 2013-04-23 | 403.99 | 408.38 | 398.81 | 406.13 | 23294100 | 406.13 | AAPL 
| 5 | 2013-04-22 | 392.64 | 402.20 | 391.27 | 398.67 | 15340900 | 398.67 | AAPL 
| 6 | 2013-04-19 | 387.97 | 399.60 | 385.10 | 390.53 | 21749700 | 390.53 | AAPL 
| 7 | 2013-04-18 | 404.99 | 405.79 | 389.74 | 392.05 | 23783300 | 392.05 | AAPL 
| 8 | 2013-04-17 | 420.27 | 420.60 | 398.11 | 402.80 | 33735300 | 402.80 | AAPL 
| 9 | 2013-04-16 | 421.57 | 426.61 | 420.57 | 426.24 | 10890600 | 426.24 | AAPL 
| 10 | 2013-04-15 | 427.00 | 427.89 | 419.55 | 419.85 | 11318300 | 419.85 | AAPL 
| 11 | 2013-04-12 | 434.15 | 434.15 | 429.09 | 429.80 | 8521900 | 429.80 | AAPL 
| 12 | 2013-04-11 | 433.72 | 437.99 | 431.20 | 434.33 | 11727300 | 434.33 | AAPL 
| 13 | 2013-04-10 | 428.10 | 437.06 | 426.01 | 435.69 | 13415800 | 435.69 | AAPL 
| 14 | 2013-04-26 | 8.35 | 8.36 | 8.26 | 8.27 | 15141900 | 8.27 | AA 
| 15 | 2013-04-25 | 8.42 | 8.50 | 8.34 | 8.39 | 18396000 | 8.39 | AA 
| 16 | 2013-04-24 | 8.12 | 8.45 | 8.12 | 8.41 | 22031100 | 8.41 | AA 
| 17 | 2013-04-23 | 8.12 | 8.17 | 8.04 | 8.12 | 16255700 | 8.12 | AA 
| 18 | 2013-04-22 | 8.12 | 8.15 | 7.99 | 8.11 | 14758200 | 8.11 | AA 
| 19 | 2013-04-19 | 8.09 | 8.11 | 8.00 | 8.08 | 15661700 | 8.08 | AA 
| 20 | 2013-04-18 | 8.00 | 8.08 | 7.90 | 8.03 | 19079900 | 8.03 | AA 
| 21 | 2013-04-17 | 8.04 | 8.08 | 7.93 | 7.96 | 27240400 | 7.96 | AA 
| 22 | 2013-04-16 | 8.08 | 8.20 | 8.06 | 8.10 | 22820600 | 8.10 | AA 
| 23 | 2013-04-15 | 8.14 | 8.17 | 8.01 | 8.04 | 32459300 | 8.04 | AA 
| 24 | 2013-04-12 | 8.30 | 8.32 | 8.17 | 8.22 | 21450400 | 8.22 | AA 
| 25 | 2013-04-11 | 8.30 | 8.40 | 8.27 | 8.32 | 13180400 | 8.32 | AA 
| 26 | 2013-04-10 | 8.43 | 8.47 | 8.30 | 8.31 | 20827200 | 8.31 | AA 
| 27 | 2013-04-26 | 31.90 | 31.98 | 31.45 | 31.79 | 47799300 | 31.79 | MSFT 
| 28 | 2013-04-25 | 31.71 | 32.84 | 31.54 | 31.94 | 110688300 | 31.94 | MSFT 
| 29 | 2013-04-24 | 30.62 | 31.92 | 30.60 | 31.76 | 90946600 | 31.76 | MSFT 
| 30 | 2013-04-23 | 30.70 | 30.90 | 30.38 | 30.60 | 59082400 | 30.60 | MSFT 
| 31 | 2013-04-22 | 30.30 | 31.18 | 30.27 | 30.83 | 137904000 | 30.83 | MSFT 
| 32 | 2013-04-19 | 29.62 | 30.24 | 29.61 | 29.77 | 99790700 | 29.77 | MSFT 
| 33 | 2013-04-18 | 28.95 | 28.98 | 28.50 | 28.79 | 56841500 | 28.79 | MSFT 
| 34 | 2013-04-17 | 28.85 | 29.04 | 28.60 | 28.83 | 52840700 | 28.83 | MSFT 
| 35 | 2013-04-16 | 28.90 | 29.14 | 28.70 | 28.97 | 52797300 | 28.97 | MSFT 
| 36 | 2013-04-15 | 28.65 | 28.98 | 28.51 | 28.69 | 56332900 | 28.69 | MSFT 
| 37 | 2013-04-12 | 28.85 | 29.02 | 28.66 | 28.79 | 62886300 | 28.79 | MSFT 
| 38 | 2013-04-11 | 29.10 | 29.20 | 28.73 | 28.94 | 130907100 | 28.94 | MSFT 
| 39 | 2013-04-10 | 29.57 | 30.32 | 29.52 | 30.28 | 71058300 | 30.28 | MSFT 
| 40 | 2013-04-26 | 21.39 | 21.53 | 21.25 | 21.40 | 17348300 | 21.40 | MS 
| 41 | 2013-04-25 | 21.56 | 21.81 | 21.39 | 21.43 | 18496600 | 21.38 | MS 
| 42 | 2013-04-24 | 21.66 | 21.78 | 21.40 | 21.45 | 17955700 | 21.40 | MS 
| 43 | 2013-04-23 | 20.97 | 21.73 | 20.91 | 21.61 | 23437700 | 21.56 | MS 
| 44 | 2013-04-22 | 20.61 | 20.88 | 20.53 | 20.71 | 16156600 | 20.66 | MS 
| 45 | 2013-04-19 | 20.37 | 20.63 | 20.16 | 20.58 | 24644100 | 20.53 | MS 
| 46 | 2013-04-18 | 21.35 | 21.47 | 20.31 | 20.31 | 47193400 | 20.26 | MS 
| 47 | 2013-04-17 | 21.54 | 21.83 | 20.86 | 21.47 | 45475800 | 21.42 | MS 
| 48 | 2013-04-16 | 21.81 | 21.86 | 21.19 | 21.85 | 21839800 | 21.80 | MS 
| 49 | 2013-04-15 | 21.75 | 22.25 | 21.41 | 21.48 | 22458100 | 21.43 | MS 
| 50 | 2013-04-12 | 22.09 | 22.23 | 21.54 | 21.82 | 25150400 | 21.77 | MS 
| 51 | 2013-04-11 | 22.28 | 22.63 | 22.24 | 22.27 | 14692800 | 22.22 | MS 
| 52 | 2013-04-10 | 21.89 | 22.53 | 21.87 | 22.22 | 17467300 | 22.17 | MS 
| 53 | 2013-04-26 | 16.15 | 17.58 | 15.86 | 17.00 | 56658800 | 17.00 | JCP 
| 54 | 2013-04-25 | 15.26 | 15.56 | 15.20 | 15.24 | 10840900 | 15.24 | JCP 
| 55 | 2013-04-24 | 15.48 | 15.60 | 15.15 | 15.19 | 7242100 | 15.19 | JCP 
| 56 | 2013-04-23 | 15.19 | 15.73 | 14.95 | 15.45 | 14552800 | 15.45 | JCP 
| 57 | 2013-04-22 | 15.36 | 15.80 | 15.31 | 15.54 | 13453300 | 15.54 | JCP 
| 58 | 2013-04-19 | 15.20 | 15.39 | 14.85 | 15.26 | 17094800 | 15.26 | JCP 
| 59 | 2013-04-18 | 14.97 | 15.29 | 14.83 | 15.16 | 29205100 | 15.16 | JCP 
| 60 | 2013-04-17 | 15.07 | 15.13 | 14.58 | 14.77 | 17433900 | 14.77 | JCP 
| 61 | 2013-04-16 | 14.59 | 15.42 | 14.45 | 15.19 | 28576300 | 15.19 | JCP 
| 62 | 2013-04-15 | 14.43 | 15.15 | 14.27 | 14.39 | 32590400 | 14.39 | JCP 
| 63 | 2013-04-12 | 15.01 | 15.03 | 14.24 | 14.62 | 36423900 | 14.62 | JCP 
| 64 | 2013-04-11 | 14.19 | 15.12 | 14.16 | 14.86 | 27459000 | 14.86 | JCP 
| 65 | 2013-04-10 | 14.03 | 14.36 | 13.55 | 14.09 | 34677000 | 14.09 | JCP 
+----------+------------+--------+--------+--------+--------+-----------+-----------+--------+

然後我做了

SELECT ticker FROM stocks; 
+--------+ 
| ticker | 
+--------+ 
|APL 
|APL 
|APL 
|APL 
|APL 
|APL 
|APL 
|APL 
|APL 
|APL 
|APL 
|APL 
|APL 
| 
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|SFT 
|SFT 
|SFT 
|SFT 
|SFT 
|SFT 
|SFT 
|SFT 
|SFT 
|SFT 
|SFT 
|SFT 
|SFT 
| 
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| 
| 
|P 
|P 
|P 
|P 
|P 
|P 
|P 
|P 
|P 
|P 
|P 
|P 
|P 
+--------+

有人可以告訴我這到底是怎麼回事的股票列？這是從CSV文件導入的，如果這意味着什麼的話。

來源

2013-05-05 saya

'SELECT ticker，length（ticker）FROM stocks' show？你的長度是否超過4？ – mvp 2013-05-05 00:11:42

你可以請'''SHOW CREATE TABLE股票\ G'''並給出結果嗎？ – luksch 2013-05-05 00:12:23

SHOW CREATE TABLE stocks \ G; *************************** 1. row ******************* ******** 表：股票創建表：CREATE TABLE'stocks'（ 'stock_ID' int（11）NOT NULL AUTO_INCREMENT， 'the_date' date NOT NULL， 'open' decimal（6， 2）NOT NULL， 'high' decimal（6,2）NOT NULL， 'low' decimal（6,2）NOT NULL， 'close' decimal（6,2）NOT NULL， 'volume' int 11）NOT NULL， 'adj_close'十進制（6,2）NOT NULL， 'ticker' VARCHAR（5）NOT NULL， PRIMARY KEY（'stock_ID'））ENGINE = MyISAM的AUTO_INCREMENT = 66默認字符集= LATIN1 – saya 2013-05-05 00:52:18

看起來你的ticker字段填充了很多尾隨空格。你可以通過執行下面的語句來解決這個問題：

UPDATE stocks SET ticker = trim(ticker)

來源

2013-05-05 00:14:13 mvp

我試過但仍然是相同的結果D; – saya 2013-05-05 00:32:47

什麼'SELECT ticker，長度（股票）從股票'顯示？你看到任何超過4的長度？ – mvp 2013-05-05 00:34:33

我爲他們中的兩個獲得了5秒。所以我想這意味着有一些尾隨。但我確實修剪它。 – saya 2013-05-05 00:42:09

SELECT查詢切斷字段？

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