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-- THIS IS WHAT U NEED<br />
<br />
update T1<br />
set T1.key=T2.key<br />
FROM &nbsp;table1 T1 Inner Join table2 T2 on T1.oldkey=T2.oldkey
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-- THIS IS WHAT U NEED

update T1
set T1.key=T2.key
FROM  table1 T1 Inner Join table2 T2 on T1.oldkey=T2.oldkey

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<div class="content wysiwyg-content">
Using MySQL, I am trying to update one column in Table1 with the value from another column in &nbsp;Table2. I guess I need a subquery, but I am not sure how to go about it. &nbsp;Previously, there was not an autoincrement primary key in the Table2. Instead, the primarykey was derived from meta data. So, to fix this problem, I added an autoincrement primary key to each Table2 record. But now I have to update each Table1 record with the new primary key from Table2. The match can be the OLD primary key (the derived one), which is in both tables. Note, the old faux primary key is a VARCHAR, not an integer, if that matters.
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Using MySQL, I am trying to update one column in Table1 with the value from another column in  Table2. I guess I need a subquery, but I am not sure how to go about it.  Previously, there was not an autoincrement primary key in the Table2. Instead, the primarykey was derived from meta data. So, to fix this problem, I added an autoincrement primary key to each Table2 record. But now I have to update each Table1 record with the new primary key from Table2. The match can be the OLD primary key (the derived one), which is in both tables. Note, the old faux primary key is a VARCHAR, not an integer, if that matters.

subquery? Update column in one table with value from another table

Databases are organized collections of data, most commonly accessed through management systems including schemas, tables, queries and processes that allow users to enter and manipulate the information or utilize it in other fashions, such as with web applications or for reporting purposes.

Databases

MySQL is an open source, relational database management system that runs as a server providing multi-user access to a number of databases. Acquired by Oracle in 2009, it is frequently used in combination with PHP installations, powering most of the WordPress installations.

MySQL Server

SQL (Structured Query Language) is designed to be used in conjunction with relational database products as of a means of working with sets of data. SQL consists of data definition, data manipulation, and procedural elements. Its scope includes data insert, query, update and delete, schema creation and modification, and data access control.