大约有 40,000 项符合查询结果(耗时:0.0310秒) [XML]

https://stackoverflow.com/ques... 

How to select an option from drop down using Selenium WebDriver C#?

I was trying for my web test selecting an option. An example can be found here: http://www.tizag.com/phpT/examples/formex.php ...
https://stackoverflow.com/ques... 

Counting null and non-null values in a single query

...le and SQL Server (you might be able to get it to work on another RDBMS): select sum(case when a is null then 1 else 0 end) count_nulls , count(a) count_not_nulls from us; Or: select count(*) - count(a), count(a) from us; ...
https://stackoverflow.com/ques... 

postgresql - sql - count of `true` values

... SELECT COALESCE(sum(CASE WHEN myCol THEN 1 ELSE 0 END),0) FROM <table name> or, as you found out for yourself: SELECT count(CASE WHEN myCol THEN 1 END) FROM <table name> ...
https://stackoverflow.com/ques... 

'IF' in 'SELECT' statement - choose output value based on column values

... SELECT id, IF(type = 'P', amount, amount * -1) as amount FROM report See http://dev.mysql.com/doc/refman/5.0/en/control-flow-functions.html. Additionally, you could handle when the condition is null. In the case of...
https://stackoverflow.com/ques... 

MySQL Select all columns from one table and some from another table

How do you select all the columns from one table and just some columns from another table using JOIN? In MySQL. 4 Answers ...
https://stackoverflow.com/ques... 

TSQL - Cast string to integer or return default value

...ing DECLARE @Test TABLE(Value nvarchar(50)) -- Result INSERT INTO @Test SELECT '1234' -- 1234 INSERT INTO @Test SELECT '1,234' -- 1234 INSERT INTO @Test SELECT '1234.0' -- 1234 INSERT INTO @Test SELECT '-1234' -- -1234 INSERT INTO @Test SELECT '$1234' ...
https://stackoverflow.com/ques... 

How can I SELECT rows with MAX(Column value), DISTINCT by another column in SQL?

... You are so close! All you need to do is select BOTH the home and its max date time, then join back to the topten table on BOTH fields: SELECT tt.* FROM topten tt INNER JOIN (SELECT home, MAX(datetime) AS MaxDateTime FROM topten GROUP BY home) groupedtt...
https://stackoverflow.com/ques... 

Search for one value in any column of any table inside a database

...OT NULL BEGIN SET @ColumnName = '' SET @TableName = ( SELECT MIN(QUOTENAME(TABLE_SCHEMA) + '.' + QUOTENAME(TABLE_NAME)) FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE = 'BASE TABLE' AND QUOTENAME(TABLE_SCHEMA) + '.' + QUOTENAME(TABLE_NAME) &...
https://stackoverflow.com/ques... 

How to retrieve the current value of an oracle sequence without increment it?

... SELECT last_number FROM all_sequences WHERE sequence_owner = '<sequence owner>' AND sequence_name = '<sequence_name>'; You can get a variety of sequence metadata from user_sequences, all_sequences and dba_...
https://stackoverflow.com/ques... 

Check if a row exists, otherwise insert

... I assume a single row for each flight? If so: IF EXISTS (SELECT * FROM Bookings WHERE FLightID = @Id) BEGIN --UPDATE HERE END ELSE BEGIN -- INSERT HERE END I assume what I said, as your way of doing things can overbook a flight, as it will insert a new row when there are 1...