Useful system stored procedures in SQL Server
Alt + F1 is a good shortcut key for sp_help. sp_helptext is another goodie for getting stored procedure text.
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How to insert Arabic characters into SQL database?
For the field to be able to store unicode characters, you have to use the type nvarchar (or other similar like ntext, nchar). To insert the unicode characters in the database you have to send the text as unicode by using a parameter type like nvarchar / SqlDbType.NVarChar. (For completeness: if you are creating SQL … Read more
How to combine two query’s results into one row?
You can use: select (Select Count(*) as StockCountA from Table_A where dept=”AAA”) as StockCountA, (Select Count(*) as StockCountB from Table_B where dept=”BBB”) as StockCountB Explanation: you can select single value as a field in a select statement, so you could write something like select x.*, (select Value from Table_Y y) as ValueFromY from Table_X x … Read more
What is the difference between “Is Not Null” and “Not Is Null”
There is no difference. It seems to me that there might be a difference when it comes to performance. Anyone care to elaborate on this? All major engines (that is MySQL, SQL Server, Oracle and PostgreSQL) will merge these predicates on parsing stage, making identical plans from them. Handling of these conditions is more complex … Read more
How to list relations in postgres schema
Try this one: \dt schema_2.
How to use String property as primary key in Entity Framework
This is the proper way of creating a PK without Identity Autoincrement enabled: [Key] [DatabaseGenerated(DatabaseGeneratedOption.None)] public string FooId { get; set; }
PostgreSQL: Create an index on timestamp::DATE [duplicate]
An expression in an index declaration should be enclosed in additional brackets, try: CREATE INDEX event_creation_time_date_idx ON event ((creation_time::DATE));
How do you get values from all columns using ResultSet.getBinaryStream() in jdbc?
You can get all the column names and the entire data from your table using the code below. writeToFile method will contain the logic to writing to file (if that was not obvious enough 🙂 ) ResultSetMetaData metadata = rs.getMetaData(); int columnCount = metadata.getColumnCount(); for (int i = 1; i <= columnCount; i++) { writeToFile(metadata.getColumnName(i) … Read more
MySQL delete all rows where id is greater than the given number
Your query was nearly perfect 😉 Just try DELETE FROM table_name WHERE ID>9; You could also use DELETE FROM table_name WHERE ID>=10; As you already mention.
Getting an average from subquery values or another aggregate function in SQL Server
I can’t see your whole query as it doesn’t seem to have posted correctly. However, I believe your problem is purely a lack of a name for your derived table / nested subquery. Give it an alias, such as MyTable in this example SELECT AVG(pageCount) FROM ( SELECT COUNT(ActionName) AS pageCount FROM tbl_22_Benchmark ) MyTable