<div>
POSTGres is comlaining...<br />
ERROR: &nbsp;syntax error at or near &quot;IF&quot;<br />
LINE 1: IF NOT EXISTS (SELECT * FROM <br />
&nbsp; &nbsp; &nbsp; &nbsp; ^<br />

</div>


<div>
I guess it works on some database but not postgres. &nbsp;No worries, I will make two calls.
</div>


<div>
<div class="content wysiwyg-content">
I didn't specify that a column has to be unique in a table, but it is too late. &nbsp;How do write an sql statement to insert only if a value is not there in that column.<br />
<br />
-- For example, if 'dave' already exists, then don't insert <br />
insert into math_score (l_name, score) values ('dave', 98);<br />
<br />

</div>
</div>


I didn't specify that a column has to be unique in a table, but it is too late.  How do write an sql statement to insert only if a value is not there in that column.

-- For example, if 'dave' already exists, then don't insert 
insert into math_score (l_name, score) values ('dave', 98);



POSTGres is comlaining...
ERROR:  syntax error at or near &quot;IF&quot;
LINE 1: IF NOT EXISTS (SELECT * FROM 
        ^


I guess it works on some database but not postgres.  No worries, I will make two calls.

sql, check if a value exist before adding

I didn&#39;t specify that a column has to be unique in a table, but it is too late.  How do write an sql statement to insert only if a value is not there in that column.

-- For example, if &#39;dave&#39; already exists, then don&#39;t insert 
insert into math_score (l_name, score) values (&#39;dave&#39;, 98);



Microsoft SQL Server is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.SQL Server is available in multiple versions, typically identified by release year, and versions are subdivided into editions to distinguish between product functionality. Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning.

Microsoft SQL Server

PostgreSQL is an object-relational database management system with an emphasis on extensibility and standards-compliance. As a database server, its primary function is to store data securely, supporting best practices, and to allow for retrieval at the request of other software applications. PostgreSQL implements the majority of the SQL2011 standard, is ACID-compliant and transactional using multiversion concurrency control (MVCC), and handles complex SQL queries using many indexing methods that are not available in other databases. It is cross-platform and runs on many operating systems including Linux, FreeBSD, OS X, Solaris, and Microsoft Windows.