BULK INSERT is a Transact-SQL statement that implements a bulk data-loading process, inserting multiple rows into a table, reading data from an external sequential file. Use of BULK INSERT results in better performance than processes that issue individual INSERT statements for each row to be adde...
This specifies that if an update or deletes statement affects rows in foreign key tables, then the action will be denied and rolled back. An error message will be raised.可以在定义外键约束的时候按需求进行设置:<COLUMN> <DATATYPE> <CONSTRAINT NAME> REFERENCES <MASTER TABLENAME>(<PRIMARY KEY ...
Feature multi-row INSERT ... VALUES statements Cannot insert multiple rows using the same INSERT statement in a natively compiled stored procedure. Create INSERT statements for each row. Feature Common Table Expressions (CTEs) Common table expressions (CTE) are not supported in natively compiled stor...
avoid insertion of duplicate entries in a BULK INSERT statement Bad performance of EXCEPT operator Basic - select with fixed values - invert columns to rows Basic CTE query, get full path of something recursive BCP Error - Copy direction must be either 'in', 'out' or 'format'. BCP Export...
worse you are doing multiple self joins. This is where you will start smiling. Let's test this functionality, how it is simple and gives better performance than self JOIN. CREATE TABLE MonthlyProfit ( yearid int, Monthid int, Profit bigint ) --- Inserting multiple records thro...
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In this recipe, a temporary table called #ProductCostStatisticswas created. The table had rows inserted into it like a regular table, and then the temporary table was queried three times (again, just like aregular table), and then dropped. The table was created and queried with the same sy...
Create a procedure to loop through SourceTable and insert rows. Note There are syntax differences between T-SQL for the CREATE PROCEDURE and the CURSOR declaration. For more information, see Stored Procedures. CREATE PROCEDURE LoopItems() BEGIN DECLARE done INT DEFAULT F...
A subquery that retrieves rows from the database. derived_table is used as input to the outer query. derived_table can use the Transact-SQL table value constructor feature to specify multiple rows. For example, SELECT * FROM (VALUES (1, 2), (3, 4), (5, 6), (7, 8), (9, 10)...
It pertains to a pattern of usage wherein strings from multiple rows are concatenated into a single large (typically comma delimited) string. The usual way that we see this being accomplished is by code like the below: DECLARE @res NVARCHAR(max) SELECT @res = COALESCE(@res + ',', '')...