大约有 40,000 项符合查询结果(耗时:0.0389秒) [XML]

https://stackoverflow.com/ques... 

How to select rows with no matching entry in another table?

... Here's a simple query: SELECT t1.ID FROM Table1 t1 LEFT JOIN Table2 t2 ON t1.ID = t2.ID WHERE t2.ID IS NULL The key points are: LEFT JOIN is used; this will return ALL rows from Table1, regardless of whether or not there is a matching row i...
https://stackoverflow.com/ques... 

How to write a foreach in SQL Server?

... the lines of a for-each, where I would like to take the Ids of a returned select statement and use each of them. 10 Answer...
https://stackoverflow.com/ques... 

PadLeft function in T-SQL

... I believe this may be what your looking for: SELECT padded_id = REPLACE(STR(id, 4), SPACE(1), '0') FROM tableA or SELECT REPLACE(STR(id, 4), SPACE(1), '0') AS [padded_id] FROM tableA I haven't tested the syntax on the 2nd example. I'm not sure if that works 100%...
https://stackoverflow.com/ques... 

Use variable with TOP in select statement in SQL Server without making it dynamic [duplicate]

...es, in SQL Server 2005 it's possible to use a variable in the top clause. select top (@top) * from tablename share | improve this answer | follow | ...
https://stackoverflow.com/ques... 

How to select a drop-down menu value with Selenium using Python?

I need to select an element from a drop-down menu. 13 Answers 13 ...
https://stackoverflow.com/ques... 

What is the purpose of Order By 1 in SQL select statement?

...number stands for the column based on the number of columns defined in the SELECT clause. In the query you provided, it means: ORDER BY A.PAYMENT_DATE It's not a recommended practice, because: It's not obvious/explicit If the column order changes, the query is still valid so you risk ordering ...
https://stackoverflow.com/ques... 

How to randomly select rows in SQL?

... SELECT TOP 5 Id, Name FROM customerNames ORDER BY NEWID() That said, everybody seems to come to this page for the more general answer to your question: Selecting a random row in SQL Select a random row with MySQL: SELECT...
https://stackoverflow.com/ques... 

ROW_NUMBER() in MySQL

...asy, but actually it kind of isn't). I often plump for a null-self-join: SELECT t0.col3 FROM table AS t0 LEFT JOIN table AS t1 ON t0.col1=t1.col1 AND t0.col2=t1.col2 AND t1.col3>t0.col3 WHERE t1.col1 IS NULL; “Get the rows in the table for which no other row with matching col1,col2 has a hi...
https://stackoverflow.com/ques... 

MySQL ON vs USING?

...n tables ON a column, a set of columns and even a condition. For example: SELECT * FROM world.City JOIN world.Country ON (City.CountryCode = Country.Code) WHERE ... USING is useful when both tables share a column of the exact same name on which they join. In this case, one may say: SELECT ... FR...
https://stackoverflow.com/ques... 

How to drop all tables in a SQL Server database?

...VARCHAR(500) DECLARE @Cursor CURSOR SET @Cursor = CURSOR FAST_FORWARD FOR SELECT DISTINCT sql = 'ALTER TABLE [' + tc2.TABLE_SCHEMA + '].[' + tc2.TABLE_NAME + '] DROP [' + rc1.CONSTRAINT_NAME + '];' FROM INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS rc1 LEFT JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS t...