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Are used to temporarily rename a table or column?
SQL aliases
SQL aliases are used to temporarily rename a table or a column heading.
Which of the following is correct regarding having clause?
Q. which of the following statement is correct about HAVING clause? A. HAVING clause is used for rows rather than columns.
When altering a table you can decrease the width of a column if?
Modify the column size. You can change the width of a column using the ALTER TABLE command. You can increase the column width at any time (that is, whether a table is empty [no rows] or non-empty). You cannot decrease the column width when the table is non-empty; a table must be empty to decrease the column width.
Why do you need to change the column name in a temp table?
Probably you want to use a #local temp table here, or maybe avoid #temp tables altogether. Why do you have the need to change the column name halfway through the script? Either name it right in the first place, or keep referencing the old name.
Do you need to rename a global temp table?
Since the #temp table (even a ##global temp table) lives in tempdb, you need to invoke sp_rename there. Why on earth are you using a ##global temp table?
Where are the temporary tables stored in tempdb?
Temporary tables are stored in the TempDB database with a unique object name and created on a connection or session level. These tables are visible and accessible within the session only. We can drop the temporary table using the DROP TABLE command or the temporary table will be dropped automatically when the session disconnects.
Which is better insert into or insert into temporary table?
Generally speaking, the performance of both options are similar for a small amount of data. Data is inserted quickly in the temporary table, but if the amount of data is large then we can experience poor query performance. This usually happens with temporary tables when we insert a large number of rows.