Mysql show columns field only

SQL:Show column only if has data in it. MySQL select one column DISTINCT, with. The DESCRIBE statement provides information similar to SHOW COLUMNS. The optional FULL keyword causes the output to include the column collation and comments, as well as the privileges you have for each column.

The LIKE clause, if present, indicates which column names to match. Your answer is not SQL, so that may explain the low number of votes. SHOW COLUMNS displays the following values for each table column : Field indicates the column name. Type indicates the column data type.

Collation indicates the collation for non-binary string columns , or NULL for other columns. This value is displayed only if you use the FULL keyword. The Null field contains YES if NULL values can be stored in.

In almost all relational databases, your queries have to return fixed numbers of columns , i. If you do not want to see entire rows from your table, just name the columns in which you are intereste separated by commas. To avoid making code changes every time we have a database change, we just use the SHOW FIELDS (Alias of SHOW COLUMNS ) to get all of the columns for Inserts. Example to get distinct values of a Column. In this example, we shall consider the following table data.

For age column , there are two distinct values 10. For section column , there are three distinct values A, B, C. For gender column , there are two distinct values M, F. So for example: select columnfrom table group by columnorder by column3. That will not fly in other databases like Postgres, Oracle, MSSQL, etc. TABLE Will give show me the table properties and whether or not the column allows null values, but is there a way to just return ONLY the columnnames which allow null.

Anything other than int it is not returning rows for. This query will list out the column names. To display all the records of a table we will use this to show column names.

Here is the sample code. But those are tab-separated columns : what if one of the columns were a text field with a literal tab? Select column names whose entries are not null. Ask Question Asked years, month ago. Active years, months ago.

I would like to have a list of those columns of a table that have at least one not-NULL data entries in them. Razvan Serea WinSnap is a fast user-friendly utility for taking and editing screenshots. It easily captures windows of non-rectangular form with transparent backgrounds including.