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44. Row and record can arguably be considered as the same thing. Fields and columns are different, a field is the intersection of a row and a column. i.e. if your table has 10 rows and 10 columns, it has 100 fields. When you create a table using DDL statements, you define columns (metadata). When you add rows using DML statement s, you define ...
Using ASP.NET MVC with C#, how do you pass some database records to a View and display them in table form? I need to know how I can transfer/pass some rows of records from a database that have been returned to an SqlDataReader object and pass that object to the View so I can display all the records contained by the object in the View using foreach.
Option 1 - Script the data to move, then run the script where you want the data: Right click on the database you want to copy. Choose 'Tasks' > 'Generate scripts'. 'Select specific database objects'. Check 'Tables'. Mark 'Save to new query window'. Click 'Advanced'. Set 'Types of data to script' to 'Schema and data'. Next, Next.
The database size does matter. If you have more than one table with more than a million records, then performance starts indeed to degrade. The number of records does of course affect the performance: MySQL can be slow with large tables. If you hit one million records you will get performance problems if the indices are not set right (for ...
In order to shuffle the SQL result set, you need to use a database-specific function call. Note that sorting a large result set using a RANDOM function might turn out to be very slow, so make sure you do that on small result sets.
No, 1,000,000 rows (AKA records) is not too much for a database. I ask because I noticed that some queries (for example, getting the last register of a table) are slower (seconds) in the table with 1 million registers than in one with 100. There's a lot to account for in that statement. The usual suspects are: Poorly written query.
Now, I want to keep track of any updates in Person Table. Here is the simple technique I used: Create a person_log table. create table person_log (date datetime2, sid int); Create a trigger on Person table that will insert a row into person_log table whenever Person table gets updated: create trigger tr on dbo.Person.
2. To retrieve data from database: private SqlConnection Conn; private void CreateConnection() string ConnStr = ConfigurationManager.ConnectionStrings["ConnStr"].ConnectionString; Conn = new SqlConnection(ConnStr); public DataTable getData() CreateConnection();
It's a two step process at. Get list of tables for your db. You can get it using. mysql -uroot -p mydb -e "show tables". Create and assign the list of tables to the array variable in this bash script (separated by a single space just like in the code below) array=( table1 table2 table3 ) for i in "${array[@]}" do.
3. Look at the query execution plan. If your query is doing a table scan, it will obviously take a long time. The query execution plan can help you decide what kind of indexing you would need on the table. Also, creating table partitions can help sometimes in cases where the data is partitioned by a condition (usually date and time).