How to query data type in oracle-Oracle-php.cn

How to query data type in oracle

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Release： 2022-05-13 16:19:26

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In Oracle, you can use the "select ... From all_tab_columns where table_name=upper('table name') AND owner=upper('database login user name');" statement to query the data type of the database table .

How to query data type in oracle

The operating environment of this tutorial: Windows 10 system, Oracle 11g version, Dell G3 computer.

How to query data type in oracle

The syntax of oracle query data type is as follows:

select column_name,data_type,DATA_LENGTH From all_tab_columns where table_name=upper(&#39;表名&#39;) AND owner=upper(&#39;数据库登录用户名&#39;);

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The example is as follows:

select column_name,data_type,DATA_LENGTH From all_tab_columns
where table_name=upper(&#39;t_department&#39;) AND owner=upper(&#39;scott&#39;)

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Expand knowledge:

1. View the field name and data type

select * from cols WHERE TABLE_name=upper(&#39;表名&#39;); (user_tab_columns缩写cols)

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2. View the data type of the specified column

select DATA_TYPE from User_Tab_Columns t where t.column_name=upper(&#39;列名&#39;) and t.table_name =upper(trim(&#39;表名&#39;));

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3. View all columns

select * from user_tab_columns where table_name = upper(‘表名’);

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4. View certain columns

select column_name,data_type,data_length,DATA_PRECISION ,DATA_SCALE from all_tab_columns where table_name=upper(&#39;表名&#39;);

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5. You can view all constraints through user_constraints

select * from user_constraints where table_name = upper(&#39;表名&#39;);

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6. View primary key constraints:

select * from user_constraints where constraint_type=&#39;P&#39;
and TABLE_name=upper(&#39;表名&#39;);

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Recommended tutorial: "Oracle Video tutorial》

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