人们希望学习批处理命令的一个普遍原因是要得到批处理强大的功能。如果你希望批量的对文件执行一些指令，...
The outer while loop starts with a value for @symbol_index of 1 and increases its values by 1 on each successive pass through the outer while loop. The @max_symbol_number is the maximum number of distinct symbols in stooq_prices. When the value of @symbol_index exceeds @max_symbol_numbe...
Can we alias name for temp table Can we creating index on non unique value columns on temporary tables Can we do MAX inside nested CASE Statement? Can we generate pipe delimited column through SQL query Can we optimise While Loop in sql server for large number of data? Can we pass par...
I do loop through a temp table in another component of my loading process to achieve almost the same thing (disabling/enabling all foreign keys on those same loading tables), driven by the same source table and again constructing a SQL statement for each key and executing it. i.e. this g...
Create sp_ procedures only in master database - SQL Server will always scan through the system catalog first Always use BEGIN TRY and BEGIN CATCH for error handling Use SET NOCOUNT ON; for stops the message that shows the count of the number of rows affected by a Transact-SQL ...
DEALLOCATE temp_cursor; DROP TABLE #tempTableColumn DROP TABLE #tempTableFinalThe query will loop through all the tables within schema “dbo” and for all the columns having datatype of “NVARCHAR” and will return Tablename along with Columnname where the value is found.This way...
The Tally (or Numbers) table is one of the most useful constructs in intermediate-level SQL. Have you ever written a T-SQL WHILE loop? How about a CURSOR? If your answer to either of those questions is yes, you’ve probably been coding some really poor-performing SQL and you may not...
FORMATFILE='C:\TEMP\SHIPPERS.FMT')ASS INSERTINTO[dbo].[shippers]WITH( IGNORE_TRIGGERS ) INSERTINTO[dbo].[shippers]WITH( KEEPIDENTITY ) INSERTINTO[dbo].[shippers]WITH( KEEPDEFAULTS ) USE[tempdb]CREATETABLEstudent(idINTPRIMARYKEY,nameNVARCHAR(200))CREATETABLEscore(scoreIdINT,levelINT)--外键约束...
uncommented at a time to populate the stored_trades for each of the four ticker symbols in the code for the script. Alternatively, you can code a while loop to successively pass through the four alternative @symbol values. The while loop was not used to keep the focus on the AI model ...
While it’s useful and commonplace to create a custom expression in a SELECT statement while using a column alias to sort the result set via the ORDER BY clause, one awful practice I’ve seen repeatedly through the years is to provide a column’s ordinal value to the ORDER BY clause. Wh...