To create the histogram, the Query Optimizer sorts the column values, computes the number of values that match each distinct column value, and then aggregates the column values into a maximum of 200 contiguous
When two tables are delete-connected to the same table through CASCADE relationships, the two tables must not be delete-connected to each other where the delete rule of the last relationship in each path is RESTRICT or SET NULL. The delete rule specified in a FOREIGN KEY clause of the CREAT...
A SQLSTATE consists of two portions: A two character class, and a three character subclass. Each character must be a digit '0' to '9' or 'A' to 'Z'.While many SQLSTATE values are prescribed by the SQL standard, others are common in the industry, specific to Spark, or Azure ...
No automatic determination of the optimal degree of parallelism is attempted by the Database Engine. For information on manually controlling the maximum degree of parallelism (MAXDOP) at the instance, database, query, or workload levels, seeServer configuration: max degree of parallelismDegree of pa...
Outer join type, specified as the comma-separated pair consisting of'Type'and one of these values: 'full'— A full join retrieves records that have matching values in the selected column of both tables, and unmatched records from both the left and right tables. ...
This example calculates the number of day boundaries crossed between dates in two columns in a table. SQL CREATETABLEdbo.Duration ( startDate DATETIME2, endDate DATETIME2 );INSERTINTOdbo.Duration (startDate, endDate)VALUES('2007-05-06 12:10:09','2007-05-07 12:10:09');SELECTDATEDIFF(day...
The maximum number of server computers that can be listed is 3000. If the server list is truncated because of the size of the buffer a warning message is displayed.Note Because of the nature of broadcasting on networks, sqlcmd might not receive a timely response from all servers. Therefore,...
Latch Guarantee consistency of in-memory structures. SQL Server engine only. Performance cost is low. To allow for maximum concurrency and provide maximum performance, latches are held only for the duration of the physical operation on the in-memory structure, unlike locks, which are held for th...
15. The maximum VALUE IS 100. Setting the VALUE TO 0 has the practical effect of disabling profiling. ALL statements are profiled except SHOW PROFILE AND SHOW PROFILES, so you will find neither of those statements IN the PROFILE list. ...
A function can have a maximum of 2,100 parameters. The value of each declared parameter must be supplied by the user when the function is executed, unless a default for the parameter is defined. Specify a parameter name by using an at sign (@) as the first character. The parameter name...