exists

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"form already exists" after form is closed and another instance opened. Delphi

I keep running into this strange problem.It almost seems to be random but I run my application and open a form, do some work with it and close it.The next time I go to open another isntance of that fo[详细]

2023-01-06 10:08 分类：问答
CASE + IF MysQL query

Problem is as follows. I have a product that can be in one of three categories (defined by category_id). Each category table has category_id field related to category_id in prod开发者_StackOverflow社区[详细]

2023-01-03 11:35 分类：问答
Invalid SQL Query

I have the next query that in my opinion is a valid one, but I keep getting error telling me that there is a proble on \"WHERE em.p4 = ue.p3\" - Unknown column \'ue开发者_StackOverflow.p3\' in \'where[详细]

2023-01-03 08:50 分类：问答
Is there alternative way to write this query?

I have tables A, B, C, where A represents items which can have zero or more sub-items stored in C. B table on开发者_开发问答ly has 2 foreign keys to connect A and C.[详细]

2023-01-02 06:45 分类：问答
If url exists Objective-c

Hey, I have a program that needs to tell if an online image exists, but the only way that I\'ve gotten this to work is by loading the image in a NSData pointer and checking if the pointer exists.[详细]

2023-01-02 06:09 分类：问答
Check if a table exist in where

This query generates an error because table2 does开发者_开发百科n\'t exist: Select * FROM table WHERE table2.id IS NOT NULL[详细]

2023-01-02 04:52 分类：问答
Oracle EXISTS query is not working as expected - DB Link bug?

I\'m completely baffled by the results of this query: select count(*) from my_tab mt wheremt.stat = \'2473\'[详细]

2023-01-02 02:26 分类：问答
Shell script to test whether a directory exists and if not create it?

I am trying to create a script to detect whether a directory exists, and if it does not, to create it.[详细]

2023-01-01 07:18 分类：问答
SQL: Return "true" if list of records exists?

An alternative title might be: Check for existence of multiple rows? Using a combination of SQL and C# I want a method to return true if all products in a list exist in a table.If it can be done all[详细]

2022-12-31 07:19 分类：问答
Check if twitter username exists

Is there a way to check if a twitter username exists? Without being authentica开发者_JAVA技巧ted with OAuth or the twitter basic authentication?UPDATE 2021: This API is not available.[详细]

2022-12-31 00:42 分类：问答