exists

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SQL Conditional Column Existence

Can I somehow select a column if exists in a view, but ignore the column if it does not exist? SELECT CASE[详细]

2023-01-28 22:27 分类：问答
Word VBA "Label Not Defined" If Bookmark exists command

I am very new to VBA and just learning. Here\'s my situation and problem: 1) I created a working userform with text and comboboxes linking to bookmarks[详细]

2023-01-28 02:41 分类：问答
SQL not exist issue

Having a bit of trouble dealing with not exist clause in a query. I have three tables: Meal no_meal integer[详细]

2023-01-27 12:37 分类：问答
File exists test does not work on cache folder...?

My program checks if a specific file exists in the default cache folder. If the file exists, it opens it and reads the contents. If the file does not exist, the file gets pulled from the web and is st[详细]

2023-01-27 07:45 分类：问答
SQL Case statement to check for NULLS and Non-existent records

I am doing a join between two tables and want to select the columns based on whether they have a record or not. I\'m trying to avoid having multiple of the same field and am trying to condense them in[详细]

2023-01-27 00:54 分类：问答
SQL: check if a table contains no nulls in a particular column

I\'m working on a stored procedure and at one point I want to check my table variable to see if there are exactly zero rows with a specific field equal null. In other words, for every row in my table,[详细]

2023-01-23 10:15 分类：问答
How can I test if a filename matching a pattern exists in Perl?

Can I do something like this in Perl? Meaning pattern match on a file name and check whether it exists.[详细]

2023-01-20 06:50 分类：问答
Stored procedure if exists not giving correct answer

I created a sql 2005 stored proc to tell me if the CRID I am searching for is approved by the supervisor. [SuperApproved] is a bit, [CRID] is char(36).Even if the CRID doesn\'t exist, I am still getti[详细]

2023-01-19 23:54 分类：问答
Strangeness with bash not operator

I\'m trying to determine if a file or directory doesn\'t exist. I tried the following commands to see if a file does exist and they work correctly:[详细]

2023-01-18 07:54 分类：问答
Does File exist in Python? [duplicate]

This question already has answers here: 开发者_JAVA百科Closed 12 years ago. Possible Duplicate: Pythonic way to check if a file exists?[详细]

2023-01-17 14:42 分类：问答