How Can I Preserve Leading Zeros in a MySQL Column?

Preserve leading zeros in MySQL columns

In some cases, numeric fields containing leading zero values ​​may lose those zeros when converted to varchar. This can happen when processing CSV files that send such fields in numeric format, resulting in unexpected missing zeros.

In order to recover and preserve leading zeros in MySQL columns, several methods can be used:

1. Use the ZEROFILL attribute to return to numeric type:

Leading zeros can be preserved by changing the field back to a numeric data type and applying the ZEROFILL attribute. ZEROFILL Adds leading zeros when necessary to maintain the target display length.

2. Use LPAD() function:

The LPAD() function allows you to add leading padding to a string. By providing a source string, the desired length, and a padding character ('0' in this case), LPAD() generates a string of the specified length, adding leading zeros as needed.

For example, use LPAD() to convert '1234567' to '01234567':

<code class="language-sql">SELECT LPAD('1234567', 8, '0');</code>

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