达梦 查询表结构的sql语句
英文回答:
To query the table structure in Dm, you can use the following SQL statement:
SELECT COLUMN_NAME, DATA_TYPE, COLUMN_LENGTH.
FROM SYSIBM.SYSCOLUMNS.
WHERE TABLE_NAME = 'your_table_name'。
This SQL statement retrieves the column name, data type, and column length information from the system catalog table SYSCOLUMNS. By specifying the TABLE_NAME parameter with the name of the table you want to query, you can obtain the structure information for that specific table.
For example, let's say we have a table named "employees" and we want to query its structure. We can execute the following SQL statement:
SELECT COLUMN_NAME, DATA_TYPE, COLUMN_LENGTH.
FROM SYSIBM.SYSCOLUMNS.
sql语句怎么查询两张表的数据 WHERE TABLE_NAME = 'employees'。
This will return a result set that includes the column name, data type, and column length for each column in the "employees" table.
中文回答:
要查询达梦数据库中的表结构,可以使用以下SQL语句:
SELECT COLUMN_NAME, DATA_TYPE, COLUMN_LENGTH.
FROM SYSIBM.SYSCOLUMNS.
WHERE TABLE_NAME = 'your_table_name'。
该SQL语句从系统目录表SYSCOLUMNS中检索列名、数据类型和列长度信息。通过将TA
BLE_NAME参数指定为您要查询的表的名称,您可以获取该特定表的结构信息。
例如,假设我们有一个名为"employees"的表,我们想要查询其结构。我们可以执行以下SQL语句:
SELECT COLUMN_NAME, DATA_TYPE, COLUMN_LENGTH.
FROM SYSIBM.SYSCOLUMNS.
WHERE TABLE_NAME = 'employees'。
这将返回一个结果集,其中包括"employees"表中每个列的列名、数据类型和列长度。
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