tatamilab.jp
ã¯ããã«ãCASEå¼ã¯ãSQL-92ã§æ¨æºã«åãå ¥ãããã¾ãããæ¯è¼çæ°ããéå ·ã§ãããããã便å©ãªããã«ãã®ç価ããã¾ãç¥ããã¦ããããå©ç¨ããã¦ããªãã£ãããCASEå¼ã®ç°¡ç¥çã§ããDECODEï¼Oracleï¼ãIFï¼MySQLï¼ãªã©ã®é¢æ°ã§ä»£ç¨ããã¦ããããã¾ãããããããã¸ã§ã¼ã»ã»ã«ã³ããããã°ã©ãã®ããã®SQL 第2çãã®ä¸ã§ãSQL-92ã§è¿½å ãããä¸ã§æãæç¨ããããã¾ãã ãã¨è¨ãããã«ï¼æ³¨1ï¼ãCASEå¼ãæ´»ç¨ããã¨SQLã§ã§ãããã¨ã®å¹ ããã£ã¨åºãããæ¸ãæ¹ãã¹ãã¼ãã«ãªãã¾ããããããå®è£ éä¾åã®æè¡ãªã®ã§ã³ã¼ãã®æ±ç¨æ§ãé«ã¾ãã¾ããç¹ã«DECODEé¢æ°ã使ã£ã¦ããOracleã¦ã¼ã¶ã¼ã«ã¯ããã²CASEå¼ã¸ã®ä¹ãæãããè¦ããã¾ããããã®ããã¹ãã¯ããããªãããã¨ãã£ã±ãã®CASEå¼ã®ä¾¿å©ãªä½¿ãæ¹ãç´¹ä»ãããã®ã§ãã ãã®è¨èã¯ããããã°ã©ãã®ããã®SQL 第2çãï¼
ãªãªã¼ã¹ãé害æ å ±ãªã©ã®ãµã¼ãã¹ã®ãç¥ãã
ææ°ã®äººæ°ã¨ã³ããªã¼ã®é ä¿¡
å¦çãå®è¡ä¸ã§ã
j次ã®ããã¯ãã¼ã¯
kåã®ããã¯ãã¼ã¯
lãã¨ã§èªã
eã³ã¡ã³ãä¸è¦§ãéã
oãã¼ã¸ãéã
{{#tags}}- {{label}}
{{/tags}}