修改PostgreSQL数据库默认用户postgres的密码PostgreSQL数据库创建一个postgres用户作为数据库的管理员，密码随机，所以需要修 退出PostgreSQL客户端\q回到
SELECT x, yFROM (SELECT 1 AS x, true AS y UNION ALL SELECT 9, true UNION ALL SELECT NULL, false)ORDER BY x;+------+--
ubuntu下postgreSQL安装配置一、安装并配置，并设置远程登陆的用户名和密码1、安装postgreSQLsudo apt-get updatesudo apt-
sql md5 最简单例子select MD5('0j46o1112665989') as mdd有时候需要将
import osos.environ["GOOGLE_APPLICATION_CREDENTIALS"] = config.credentials_path
安装mysql
SELECT TIMESTAMP("2010-07-07 10:20:00+00") AS later_timestamp, TIMESTAMP("2008-12-25 15:30:00+00") AS earlier_timestamp, TIMESTAMP_DIFF(TIMESTAMP "2010-07-07 10:20:00+00", TIMESTAMP "2008-12-25 15:
SELECT IFNULL(a, b); 如果a是null 返回b,否则返回aSELECT IFNULL(null, "RUNOOB");IFNULL(null, “RUNOOB”)RUNOOBSELECT IFNULL("Hello", "RUNOOB");IFNULL(null, “RUNOOB”)Hello
SELECT STRING_AGG(fruit) AS string_aggFROM UNNEST(["apple", NULL, "pear", "banana", "pear"]) AS fruit;string_aggapple,pear,banana,pearSELECT STRING_AGG(fruit, " & ") AS string_aggFROM UNNEST(["app
biqguerySELECT TIME "15:30:00" as original_time, TIME_ADD(TIME "15:30:00", INTERVAL 10 MINUTE) as later;original_timelater15:30:0015:40:00SELECT "2020-08-08 15:30:00" as original_time, date_ADD(
展平数组SELECT *FROM UNNEST(['foo', 'bar', 'baz', 'qux', 'corge', 'garply', 'waldo', 'fred']) AS elementWITH OFFSET AS offsetORDER BY offset;elementoffsetfoo0bar1baz2qux3corge4garply5waldo6fred7如需展平一整列 A
句法SUBSTR(string, start, length)SELECT SUBSTR("SQL Tutorial", 5, 3) AS ExtractString;ExtractStringTut
WITH Sales AS ( SELECT 123 AS sku, 1 AS day, 9.99 AS price UNION ALL SELECT 123, 1, 8.99 UNION ALL SELECT 456, 1, 4.56 UNION ALL SELECT 123, 2, 9.99 UNION ALL SELECT 789, 3, 1.00 UNION ALL SELEC
rightWITH Roster AS (SELECT 'Adams' as LastName, 50 as SchoolID UNION ALL SELECT 'Buchanan', 52 UNION ALL SELECT 'Coolidge', 52 UNION ALL SELECT 'Davis', 51 UNION ALL SELECT 'Eisenhower', 77),Team
WITH Roster AS (SELECT 'Adams' as LastName, 50 as SchoolID UNION ALL SELECT 'Buchanan', 52 UNION ALL SELECT 'Coolidge', 52 UNION ALL SELECT 'Davis', 51 UNION ALL SELECT 'Eisenhower', 77),TeamMasco
WITH Produce AS (SELECT 'kale' as item, 23 as purchases, 'vegetable' as category UNION ALL SELECT 'orange', 2, 'fruit' UNION ALL SELECT 'cabbage', 9, 'vegetable' UNION ALL SELECT 'apple', 8, 'fruit
, [STRUCT("Rudisha" as name, [23.4, 26.3, 26.4, 26.1] a
过滤数组 以下示例在 ARRAY() 运算符的子查询中使用 WHERE 子句，以过滤返回的行。WITH sequences AS (SELECT [0, 1, 1, 2, 3, 5] AS some_numbers UNION ALL SELECT [2, 4, 8, 16, 32] AS some_numbers UNION ALL SELECT [5, 10] AS some_num
WITH fruits AS (SELECT "apple" AS fruit UNION ALL SELECT "pear" AS fruit UNION ALL SELECT "banana" AS fruit)SELECT ARRAY_AGG(fruit) AS fruit_basketFROM fruits;+-----------------------+| fruit_bas
WITH Numbers AS (SELECT 90 as A, 2 as B UNION ALL SELECT 50, 8 UNION ALL SELECT 60, 6 UNION ALL SELECT 50, 10)SELECT A, B, CASE A WHEN 90 THEN 'red' WHEN 50 THEN 'blue' ELSE 'green' END
#coding:utf8conn = MySQLdb.connect(host = “localhost”, user = “root”, passwd = “123456”, db = “myDB”)cursor = conn.cu
import pandas as pdimport refrom impala.dbapi import connectfrom impala.util import as_pandasfrom impala.dbapi import connectimp
select SUBSTR('我爱中国我爱毛主席', 0, 4) as cutstr行cutstr1我爱中国
WITH buy_fruit AS (SELECT 'Sophia Liu' as name, 9 as price ,'apple' as fruit UNION ALL SELECT 'Lisa Stelzner', 5,'pear' UNION ALL SELECT 'Nikki Leith', 3 ,'banana' UNION ALL SELECT 'Lauren Matthews', 11,'grape' UNION ALL SELECT 'Lisa St
WITH finishers AS (SELECT 'Sophia Liu' as name, 'F30-34' as division ,'apple' as fruit UNION ALL SELECT 'Lisa Stelzner', 'F35-39','pear' UNION ALL SELECT 'Nikki Leith', 'F30-34' ,'banana' UNION ALL SELECT 'Lauren Matthews', 'F35-39','grape'.
WITH Produce AS (SELECT 'kale' as item, 23 as purchases, 'vegetable' as category UNION ALL SELECT 'orange', 2, 'fruit' UNION ALL SELECT 'cabbage', 9, 'vegetable' UNION ALL SELECT 'apple', 8, 'fruit' UNION ALL SELECT 'leek', 2, 'vegetable' UNION
返回后续行的 值。更改 offset 值会改变所返回的后续行；默认值是 1，表示窗口框架中的下一行WITH finishers AS (SELECT 'Sophia Liu' as name, TIMESTAMP '2016-10-18 2:51:45' as finish_time, 'F30-34' as division UNION ALL SELECT 'Lisa Stelzner', TIMESTAMP '2016-10-18 2:54:11', 'F35-39' UNION
| | |namefinish_timedivisionfastest_time delta_in_secondsCarly Forte 03:08:58 F25-29 03:08:58 0Sophia Liu 02:51:45 F30-34 02:51:45 0Nikki Leith 02:59:01 F30-34 02:51:45 436Jen Edwards 03:06:36 F30-34 02:51:45 891Meghan Lederer 03:0
SELECT fruit, STRING_AGG(fruit, " & ") OVER (ORDER BY LENGTH(fruit) ROWS BETWEEN 0 FOLLOWING AND 3 FOLLOWING) AS string_aggFROM UNNEST(["apple", "pear", "banana", "pear",'aa','cc','dfef']) AS fruit;SELECT fruit , STRING_AGG(cast(fruit a
with f as (select * from UNNEST([1, 3,8,9,13,23, 5, 4, 23,55,77,6]) as fruit ) SELECT *, STRING_AGG(cast(fruit as string), " , ") OVER (ORDER BY fruit ROWS BETWEEN 0 FOLLOWING AND 3 FOLLOWING) as click_historyFROM f where fruit>4 ;STRING_AGG 的.
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