To select everything from a table, use * (asterisk operator) Select * from employee; After writing the query, click on the execute button to check for errors Once the query is executed, the table appears Select Distinct in SQL A column often contains many duplicate values, and sometimes the...
For SQL Server 2008 and newer, Microsoft introduced the exceptionally useful MERGE operation which is similar to the above INNER JOIN method, but MERGE attempts to perform both an UPDATE and an INSERT command together. This effectively synchronizes the two tables based on the query performed, upda...
Well, this how we work with Delete query inSQLand where to use Truncate command in SQL. The table below gives a quick difference between these two commands. This bring us to end of this part of tutorial where we learned how delete and truncate command in SQL. Here we learned how to de...
Select –We can select the data as per the condition which was given in the query. This is the SQL statement that was used to select the specified data from a table. We can use select with a distinct count statements to retrieve unique count from the column. Name of column –This is ...
Add Time in SQL HH:MM:SS to another HH:MM:SS Adding a column to a large (100 million rows) table with default constraint adding a extra column in a pivot table created uisng T-SQL Pivot Table query Adding a partition scheme to an existing table. Adding a Value to a 'date' Column...
This query returns number of cities where customers live: cities 3 Discussion To count the number of different values that are stored in a given column, you simply need to designate the column you pass in to the COUNT function as DISTINCT. When given a column, COUNT returns the number of ...
Add Embedded Image to Body of Email Add empty row to Datagridview Add EncodingType to Nonce element on SOAP Message (WS-Security) Add fonts to resources file Add hexidecimal character to a string Add IList to IList Add Images to DatagridView Cell Add months to GETDATE() function in sql se...
That’s why it’s generally a good idea to look out for the SELECT statement, the DISTINCT clause and the LIKE operator. The SELECT Statement A first thing that you can already check when you have written your query is whether the SELECT statement is as compact as possible. Your aim here...
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In that case, we replace the description with the product name. The following query uses CASE to convert long descriptions to NULL, then uses COALESCE() to fallback to the product name. SELECT DISTINCT product_name, description, COALESCE( CASE WHEN LENGTH(description) >= 60 THEN NULL ELSE ...