database-table

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Design Implementation SQL tables

I am new to SQL and been given a task. Following are the details: What I have: A C# desktop application for User login and view user status (only two options: user logs in and check status of all u[详细]

2023-01-25 04:28 分类：问答
Create table in SQLite only if it doesn't exist already

I want to create a table i开发者_如何学编程n a SQLite database only if doesn\'t exist already. Is there any way to do this? I don\'t want to drop the table if it exists, only create it if it doesn\'t.[详细]

2023-01-23 18:06 分类：问答
sql cross join query [closed]

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or开发者_运维技巧 rhetorical andcannot be reasonably answered in its current form.[详细]

2023-01-11 14:04 分类：问答
Datatable constraints with C#

I have a Data table whose primary key should be case sensitive. i.e. \'abc\' and \'ABC\' should be consid开发者_C百科ered unique. Hence I have enabled CaseSensitive property of a datatable to true. Bu[详细]

2023-01-10 01:35 分类：问答
Is there a shortcut to normalizing a table where the columns=rows?

Suppose you had the mySQL table describing if you can mix two substances ProductABC ---------------------[详细]

2023-01-09 11:47 分类：问答
SQL Server, Unused tables for a long time (How to get rid of unnecessary tables)?

I开发者_高级运维s there a way to find the unused tables which are nothing else but rubbish in database? The only way I can think of working out if a table is being used is to use sys.dm_db_index_usage[详细]

2023-01-08 02:14 分类：问答
Separate tables for just one field can be logical?

If I have one table which has a City fie开发者_如何学编程ld and as expected this field will repeat itself so only separate it to another table can be ok for normalizing concepts? I mean separated tabl[详细]

2023-01-02 19:10 分类：问答
T-SQL Pivot? Possibility of creating table columns from row values

Is it actually possible to rotate a T-SQL (2005) so that (for the sake of argument) the values of the first column\'s rows become the titles of th开发者_StackOverflow中文版e output table\'s columns?[详细]

2023-01-01 11:55 分类：问答
Truncating all tables in a Postgres database

I regularly need to delete all the data from my PostgreSQL database before a rebuild. How would I do this directly in SQL?[详细]

2022-12-30 09:01 分类：问答
How can I delete the contents of all tables in my database in phpMyAdmin without dropping the database?

How can I empty the co开发者_JS百科ntents of all tables in my database in phpMyAdmin without dropping any of the tables in the database?[详细]

2022-12-24 16:33 分类：问答