(*1) LEFT/RIGHTé¢æ°ã®æ¹ãå¯èªæ§ãè¯ãããç°å¢ã«ãã£ã¦åãã§ãã¯ã¨ã©ã¼ã«å¼ã£ããã£ãã®ã§SUBSTRINGç³»ãä½¿ç¨ (*2) æå®æ¸å¼ã¯æ§ã Redshift / PostgreSQL Redshift: 1.0 postgreSQL: 8.4.20 æååæ½åºã¯ SUBSTRING LEFTé¢æ°ã®æ¹ãå¯èªæ§ãè¯ãããç°å¢ã«ãã£ã¦åãã§ãã¯ã¨ã©ã¼ã«å¼ã£ããã£ãã®ã§SUBSTRINGãä½¿ç¨ åå¤æ㯠CAST Redshift㯠TO_* é¢æ°æªãµãã¼ã æååçµå㯠"||" INTERVALå¤ã¯ã¯ã©ã¼ãè¦ /* 5ç§åä½ */ SELECT CASE /* 5ç§åä½ */ -- 0ã4ç§ã¯hh:mm:s5 WHEN SUBSTRING(CAST(_timestamp AS VARCHAR), LENGTH(CAST(_timestamp AS VARCHAR)) - 1 +
PostgreSQLãPythonããæ±ãã«ã¯ãããã¤ãã®æ¹æ³ãããã¾ãããããã§ã¯ãWindows 10ã§ãpsycopg2ã使ç¨ãã¦æ¥ç¶ããæ¹æ³ã«ã¤ãã¦èª¬æãã¾ãã psycopg2ã«ã¤ã㦠psycopg2ã® å ¬å¼ãµã¤ã ãããã¦ã³ãã¼ããããã¨ãã§ãã¾ããWindows 10ã§ã¯ã以ä¸ã®æé ã§ã¤ã³ã¹ãã¼ã«ãã¦ãã ããã ç»é¢ä¸å¤®é¨ã®Windows port of Psycopgãã¯ãªãã¯ãã¦ãã ããã èªåã®ç«¯æ«ã«è©²å½ãããã¡ã¤ã«ãã¯ãªãã¯ãã¦ãã ãããï¼æ¬ãµã¤ãã§ã¯ãPython3.5ã®64Bitçãé¸æãã¦ä½æ¥ãé²ãã¦ãã¾ããï¼ ãã¦ã³ãã¼ãå¾ããã¡ã¤ã«ãå®è¡ãã¾ãã次ã¸ãã¿ã³ãã¯ãªãã¯ãã¦ãã ããã Pythonã®ã¤ã³ã¹ãã¼ã«ãã©ã«ããæå®ããã¦ãããã¨ã確èªãã¦ã次ã¸ãã¿ã³ãã¯ãªãã¯ãã¦ã¤ã³ã¹ãã¼ã«ãé²ãã¦ãã ããã ãµã³ãã«ããã°ã©ã #!/usr/bin/python3
Row_Numberã¨rankã¨dense_rank é ä½ãé£çªãæ±ãã é ä½ãé£çªãæ±ããã®ã«ä½¿ãã®ããRow_Numberé¢æ°ã¨ranké¢æ°ã¨dense_ranké¢æ°ã§ãã create table RankingSample(ID,Score) as select 1,100 from dual union all select 1, 90 from dual union all select 1, 90 from dual union all select 1, 80 from dual union all select 1, 70 from dual union all select 2,100 from dual union all select 2,100 from dual union all select 2,100 from dual union all select
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> install.packages('RPostgreSQL') > library(RPostgreSQL) > con <- dbConnect(PostgreSQL(), host="localhost", > port=5432, user= "postgres", password="*****", dbname="db_name") > dbListTables(con) # ãã¼ãã«ä¸è¦§åå¾ > dbListFields(con, "users") # usersãã¼ãã«ã®ã«ã©ã åä¸è¦§åå¾ > con <- dbConnect(PostgreSQL(), host="localhost", port=5432, user="aikawa", password="", dbname="wantedly") > light_query <- "SELECT * FROM use
Â¥copy : é éãã¼ã¿ãã¼ã ãã¼ã¿ãã¼ãã«ã¯ãä¸è¬ã« COPY ã³ãã³ãã使ãã¾ãããã¼ã¿ãã¼ã¹ã»ãµã¼ãä¸ã«ãããã¡ã¤ã«ããã®ãã¼ãã®ä»ãCOPY FROM STDIN ã®å½¢å¼ã§ãããã¯ã¼ã¯çµç±ã§ã®ãã¼ããã§ãã¾ããpsql 㮠¥copy ã¡ã¿ã³ãã³ãã¯ããã® COPY FROM STDIN ã®å¥åã§ãã =# Â¥copy ãã¼ãã« from 'ãã¼ã«ã«ãã¹'; SQL ã® COPY ã¨ã¯ç°ãªãããã¡ã¤ã«åã«ã¯ psql ãå®è¡ãããã·ã³ã§ã®ãã¼ã«ã«ãã¹ãæå®ãã¾ãããã®ãã¹ã¯çµ¶å¯¾ãã¹ãç¸å¯¾ãã¹ã®ã©ã¡ãã§ãæ§ãã¾ããã Â¥x : åã縦ã«å±é表示 åæ°ãå¤ããã¿ã¼ããã«ç»é¢ã§1è¡ãæãè¿ããã¦ãã¾ãå ´åã«ã¯ãÂ¥x ã§åã縦ã«è¡¨ç¤ºãããã¨èªã¿ããããªãã¾ããããã©ã«ãã§ã¯è¡ã¨åãæ ¼åç¶ã«è¡¨ç¤ºãã¾ããï¼ =# SELECT oid, datname FROM pg_database;
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