Databases
AdventureWorks2019
DatabaseLogdbo
 
Search
scanning

Scanning is the default search option for small tables.

Enter text here to perform a scan over supported column types.

Text columns with limited length use a substring search If the entered text is a number, integer columns will be scanned for an exact match of the value.

text to scan for
› search options
seeking

Seeking is the default search option for large tables.

Seeking requires indexes and can only be done using the column (or columns) the index is defined on.

In the single-column case, the database will seek to the position the entered search term would be at and return all rows greater or equal to that value.

In the multiple-column case, the above still applies to the column you supplied non-empty search text for. All previous columns, however, will be using an equality match.

DatabaseLogID
 
 

Note that there are some explanatory texts on larger screens.

plurals
  1. DLdbo
    primarykey
    data
    text
  2. DLdbo
    primarykey
    data
    text
  3. DLdbo
    primarykey
    data
    text
  4. DLdbo
    primarykey
    data
    text
    -- uspLogError logs error information in the ErrorLog table about the -- error that caused execution to jump to the CATCH block of a -- TRY...CATCH construct. This should be executed from within the scope -- of a CATCH block otherwise it will return without inserting error -- information. CREATE PROCEDURE [dbo].[uspLogError] @ErrorLogID [int] = 0 OUTPUT -- contains the ErrorLogID of the row inserted AS -- by uspLogError in the ErrorLog table BEGIN SET NOCOUNT ON; -- Output parameter value of 0 indicates that error -- information was not logged SET @ErrorLogID = 0; BEGIN TRY -- Return if there is no error information to log IF ERROR_NUMBER() IS NULL RETURN; -- Return if inside an uncommittable transaction. -- Data insertion/modification is not allowed when -- a transaction is in an uncommittable state. IF XACT_STATE() = -1 BEGIN PRINT 'Cannot log error since the current transaction is in an uncommittable state. ' + 'Rollback the transaction before executing uspLogError in order to successfully log error information.'; RETURN; END INSERT [dbo].[ErrorLog] ( [UserName], [ErrorNumber], [ErrorSeverity], [ErrorState], [ErrorProcedure], [ErrorLine], [ErrorMessage] ) VALUES ( CONVERT(sysname, CURRENT_USER), ERROR_NUMBER(), ERROR_SEVERITY(), ERROR_STATE(), ERROR_PROCEDURE(), ERROR_LINE(), ERROR_MESSAGE() ); -- Pass back the ErrorLogID of the row inserted SET @ErrorLogID = @@IDENTITY; END TRY BEGIN CATCH PRINT 'An error occurred in stored procedure uspLogError: '; EXECUTE [dbo].[uspPrintError]; RETURN -1; END CATCH END;
  5. DLdbo
    primarykey
    data
    text
  6. DLdbo
    primarykey
    data
    text
  7. DLdbo
    primarykey
    data
    text
  8. DLdbo
    primarykey
    data
    text
  9. DLdbo
    primarykey
    data
    text
...and more
 

Querying!

 
Guidance
A table list

Lists show table rows with slightly less information than detail views, therefore not requiring section labels.

This list shows the beginning of an entire table.

Search

Searching on lists works via indexes when the table is large. On the left you see input fields generated from viable indexes and an expandable report for all indexes that are unavailable for searching with the respective reasons.

Searching along indexes is called seeking and this is one of the main values that databases offer. The trivial alternative is scanning, which is potentially inefficient as it works by walking the entirety of the candidate rows to find the matches.

The offer to scan is given for small tables. Currently, this only works on text and integer columns and they are searched all at once.

Loading more

Loading more rows than the initial 10 results is also currently restricted to a single reloading of 100 entries.

A future version will keep auto-loading on scroll for tables that have suitable indexes.

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If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

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