I want to list the fields of the tables in the specified database

the result returned is empty

! [picture upload.]
obviously I have created a field

Sqlserver c-sharp

Mar.20,2021

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Static member initialization exception this is the connection to the database
private static string connStr = ConfigurationManager.ConnectionStrings [ "data "] .ConnectionString; what does that mean? I don t understand. I m going to connect to the database and winform . What is [ "data "] copy it from a blogger. ...

Sqlserver c-sharp

Mar.22,2021
The C-sharp database program tried to execute DROP LOGIN with Sqlcommand, but failed.
I want to use the Sqlcommand of C-sharp to execute DROP LOGIN (user) to delete the login account of SQL Server, but it seems that Sqlcommand cannot execute this statement. I can successfully execute it under SQL Server management studio and console. Is ...

Sqlserver c-sharp

Mar.23,2021

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e4969e-44088.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e4969e-44088.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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