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gratt 2024/02/29
sql

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gratt 2016/09/03
sqlã‚ã¾ã‚Šæ›¸ããŸããªã„ãŒã€‚ã€‚ã‚«ãƒ¬ãƒ³ãƒ€ãƒ¼ä½œã‚‹ã®ã¯é¢ç™½ã‹ã£ãŸã€‚

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gratt 2016/09/02
sql
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gratt 2015/10/19
sql
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SQLæ„Ÿè¦šã§HiveQLã‚’æ›¸ãã¨ç—›ã„ç›®ã«ã‚ã†ä¾‹ - still deeper
Hadoop Advent Calendar 2013 4æ—¥ç›®ã®è¨˜äº‹ã§ã™ tl;dr explainã¨job historyã‚’èªã‚ 1 reducerã¯æ‚ª data skewã¯æ‚ª å‰æ›¸ã ã¿ã‚“ãªå¤§å¥½ãSQLã§Hadoopä¸Šã§ã®å‡¦ç†ã‚’å®Ÿè¡Œã§ãã‚‹Hiveã«ã¯ã¿ãªã•ã‚“æ™®æ®µã‹ã‚‰ãŠä¸–è©±ã«ãªã£ã¦ã„ã‚‹ã“ã¨ã§ã—ã‚‡ã†ã€‚ã¡ã‚‡ã£ã¨èª¿ã¹ç‰©ã§ã‚°ã‚°ã‚‹åº¦ã«ç›®ã«å…¥ã‚‹æ„›ã‚‰ã„ã—ã„ãƒžã‚¹ã‚³ãƒƒãƒˆãŒã€è’ã‚“ã å¿ƒã«æ¸…æ¶¼ãªé¢¨ã‚’ã¯ã“ã‚“ã§ãã‚Œã¾ã™ã€‚ ã§ã™ãŒHiveã®ã‚¯ã‚¨ãƒªè¨€èªžã¯SQLã§ã¯ãªãHiveQLã§ã™ã—ã€å®Ÿè¡Œã‚¨ãƒ³ã‚¸ãƒ³ã‚‚RDBã®ãã‚Œã¨ã¯å…¨ãç•°ãªã‚‹MapReduceã§ã™ã€‚SQLã®ã¤ã‚‚ã‚Šã§HiveQLã‚’æ›¸ã„ã¦ã„ã‚‹ã¨åœ°é›·ã‚’è¸ã‚“ã§ã—ã¾ã†ã“ã¨ãŒã¾ã‚Œã«ã‚ˆãã‚ã‚Šã¾ã™ã€‚æœ¬ã‚¨ãƒ³ãƒˆãƒªã§ã¯é™¥ã‚ŠãŒã¡ãªHiveQLã®è½ã¨ã—ç©´ã‚’2ã¤ç´¹ä»‹ã—ã¾ã™ã€‚ ä¾‹1 SELECT count(DISTINCT user_id) FROM access_log SQLã«æ…£ã‚ŒãŸæ–¹ã§ã‚ã‚Œ
gratt 2015/05/14
sql

HiveQL
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gratt 2015/03/16
sql

Webåˆ¶ä½œ

security
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gratt 2013/04/25
sql
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gratt 2013/01/16
database

sql
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gratt 2012/12/08
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sql

db

programming
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