Introduction If you’ve been developing in SQL Server for any length of time, you’ve no doubt hit this scenario: You have an existing, working query that produces results your customers or business owners say are correct. Now, you’re asked to change something, or perhaps you find out yo...
Before we move forward to check the record in thetable. As an example, we will create a table program using the SQL statements contained in theBaeldung University schema. Now, to check if a record exists, we have to make a SELECT query targeting the relevant table and conditions. If the ...
Unlike in Oracle, sqlserver has an special data type in order by make identity growth. But what about if the number is exceed or approaching the limited ? Yes. there will show an error like : Arithmetic overflow error converting IDENTITY to data type int. Arithmetic overflow occurred. In fac...
SQL Copy So far so good. Right. Now we are going to see the multiple ways to check whether the column exists in a table. Assume that we are going to add a new column “LastName” to the table “Employee” Here we are going to discuss three approaches through which we can check if...
This is like the previous command, but the-ioption tellsmyisamchkto print additional statistical information. In most cases, a simplemyisamchkcommand with no arguments other than the table name is sufficient to check a table. PREVHOMEUPNEXT...
I was trying to do some kind of query optimization tree using C# .reading any query statement from user and then do some operations over it. but what i can't did was to check if this query is valid or not in other wo...
4. Which process is consuming most of the memory or how to identify the cause of memory leakage? What is an instrument in terms of performance schema? Instruments are a combination of different sets of components like wait, io, sql, binlog, file, etc. If we combine these components, they...
Or do something else programmatically. Checking if an index exists is a pretty frequent task. But there’s no simple function to test if an index exists in SQL Server. Here’s what I’ll show you in this post: Example code to check if an index exists using OBJECT_ID. The code is si...
In PostgreSQL, the “\d” command, the “\d+” command, “information_schema”, and the “SELECT *” statements with the “FALSE” option are used to check the table’s structure. The “\d” and “\d+” are meta-commands and must be executed from the “SQL Shell” aka psql. Whil...
➞ SQL Server In SQL Server, you’ll use theIDENTITYkeyword to set your primary key (oritem_numberin our use case). By default, the starting value ofIDENTITYis 1, and it will increment by 1 with each new entry unless you tell it otherwise. ...