大约有 46,000 项符合查询结果(耗时:0.0346秒) [XML]

https://stackoverflow.com/ques... 

Efficiently convert rows to columns in sql server

...ou can use the PIVOT function to transform the data from rows to columns: select Firstname, Amount, PostalCode, LastName, AccountNumber from ( select value, columnname from yourtable ) d pivot ( max(value) for columnname in (Firstname, Amount, PostalCode, LastName, AccountNumber) ) piv; S...
https://stackoverflow.com/ques... 

generate days from date range

...000 days, and could be extended to go as far back or forward as you wish. select a.Date from ( select curdate() - INTERVAL (a.a + (10 * b.a) + (100 * c.a) + (1000 * d.a) ) DAY as Date from (select 0 as a union all select 1 union all select 2 union all select 3 union all select 4 union all ...
https://stackoverflow.com/ques... 

Is it possible to use the SELECT INTO clause with UNION [ALL]?

... This works in SQL Server: SELECT * INTO tmpFerdeen FROM ( SELECT top 100 * FROM Customers UNION All SELECT top 100 * FROM CustomerEurope UNION All SELECT top 100 * FROM CustomerAsia UNION All SELECT top 100 * FROM CustomerAme...
https://stackoverflow.com/ques... 

Best way to test if a row exists in a MySQL table

... You could also try EXISTS: SELECT EXISTS(SELECT * FROM table1 WHERE ...) and per the documentation, you can SELECT anything. Traditionally, an EXISTS subquery starts with SELECT *, but it could begin with SELECT 5 or SELECT column1 or anything ...
https://stackoverflow.com/ques... 

LISTAGG in Oracle to return distinct values

... 19c and later: select listagg(distinct the_column, ',') within group (order by the_column) from the_table 18c and earlier: select listagg(the_column, ',') within group (order by the_column) from ( select distinct the_column from t...
https://stackoverflow.com/ques... 

How can I select from list of values in SQL Server

... would be to use a find an replace with UNION to get the distinct values. SELECT 1 UNION SELECT 1 UNION SELECT 1 UNION SELECT 2 UNION SELECT 5 UNION SELECT 1 UNION SELECT 6 Applied to your long line of comma delimited text Find and replace every comma with UNION SELECT Add a SELECT in front of ...
https://stackoverflow.com/ques... 

Select random row from a sqlite table

... Have a look at Selecting a Random Row from an SQLite Table SELECT * FROM table ORDER BY RANDOM() LIMIT 1; share | improve this answer ...
https://stackoverflow.com/ques... 

How to filter SQL results in a has-many-through relation

... Results: Total runtimes from EXPLAIN ANALYZE. 1) Martin 2: 44.594 ms SELECT s.stud_id, s.name FROM student s JOIN student_club sc USING (stud_id) WHERE sc.club_id IN (30, 50) GROUP BY 1,2 HAVING COUNT(*) > 1; 2) Erwin 1: 33.217 ms SELECT s.stud_id, s.name FROM student s JOIN ...
https://stackoverflow.com/ques... 

Can you create nested WITH clauses for Common Table Expressions?

..., the form of the statement you are looking for would be WITH x AS ( SELECT * FROM MyTable ), y AS ( SELECT * FROM x ) SELECT * FROM y share | improve this answer | ...
https://stackoverflow.com/ques... 

Select count(*) from multiple tables

How can I select count(*) from two different tables (call them tab1 and tab2 ) having as result: 18 Answers ...