Sample table: customer customer_id | cust_name | city | grade | salesman_id -------------+----------------+------------+-------+------------- 3002 | Nick Rimando | New York | 100 | 5001 3007 | Brad Davis | New
Sample table: emp_details EMP_IDNO EMP_FNAME EMP_LNAME EMP_DEPT --- --- --- --- 127323 Michale Robbin 57 526689 Carlos Snares 63 843795 Enric Dosio 57 328717 Jhon Snares 63 444527 Joseph Dosni 47 659831 Zanifer Emily 47 847674 Kuleswar Sitaraman 57 748681 Henrey Gabriel 47 555935 A...
This is not what I do with SQL Practice Problems. You pay a one-time fee, and get lifetime updates.You get the full problem set, along with the complete instructions (with a video walk-through) for setting up the sample database.You work with the exact same tools that you would use ...
For variable-sized tiling, always build a B-tree index on the SDO_GROUPCODE column of the<layername>_SDOINDEX table before trying any queries using this table. A.2.4 Tuning Point Data Point data, unlike line and polygon data, has the unique characteristic of containing one tile per point....
For example, knowing that a frequently used query joins two or more tables helps you determine the best type of indexes to use. Understand the characteristics of the columns used in the queries. For example, an index is ideal for columns that have an integer data type and are also uniqu...
This is the widely used join for queries. SELECT * FROM Table_A JOIN Table_B; SELECT * FROM Table_A INNER JOIN Table_B; LEFT (OUTER) JOIN: Retrieves all the records/rows from the left and the matched records/rows from the right table. SELECT * FROM Table_A A LEFT JOIN Table_B ...
Avoid using non-parameterized queries Using non-parameterized queries when that isn't necessary isn't a best practice. An example is in the case of ad hoc analysis. Cached plans can't be reused, which forces Query Optimizer to compile queries for every unique query text. For more information...
Parameterized queries have a single query plan based on the parameters used for the first execution. Only one query plan is cached and used for all parameter values. This can cause a query plan to be inefficient for some values of the parameter, also known as a parameter sensitive plan.Param...
When you change the collation of a user database, there can be collation conflicts when queries in the database access temporary tables. Temporary tables are always stored in the tempdb system database, which uses the collation for the instance. Queries that compare character data between the us...
url_replace_redirects.sh - extracts the URLs from a given string arg, file or standard input, queries each one and outputs the entire contents to stdout with the urls replaced by the redirected urls urlopen.sh - opens the URL given as an arg, or first URL found from stdin or a given ...