SHOW COLUMNS 是MySQL 中的一个命令,用于显示表中的列信息。这个命令可以帮助开发者查看表的结构,包括列名、数据类型、是否允许为空、键信息等。 语法 代码语言:txt 复制 SHOW COLUMNS FROM table_name; 或者 代码语言:txt 复制 SHOW COLUMNS FROM database_name.table_name; 优势 快速查
5、Show Columns 显示列信息; mysql>showcolumnsfromtest.t1;+---+---+---+---+---+---+|Field|Type|Null|Key|Default|Extra|+---+---+---+---+---+---+|id|int(11)|YES||NULL|||name|varchar(100)|YES||NULL||+---+---+---+---+---+---+2rowsinset(0.00sec) mysql>sho...
Database changed mysql> SHOW TABLES; +---+ | Tables_in_mysql | +---+ | columns_priv | | db | | engine_cost | | event | | func | | general_log | | gtid_executed | | help_category | | help_keyword | | help_relation | | help_topic | | innodb_index_stats | | innodb_ta...
SHOW COLUMNS FROM mytable FROM mydb; SHOW COLUMNS FROM mydb.mytable; The optional EXTENDED keyword causes the output to include information about hidden columns that MySQL uses internally and are not accessible by users. The optional FULL keyword causes the output to include the column collation...
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SHOW DATABASES︰列出 MySQL Server 上的資料庫。 SHOW TABLES [FROM db_name]︰列出資料庫的資料表。 SHOW TABLE STATUS [FROM db_name]︰列出資料庫的資料表,提供比較詳細的訊息。 SHOW COLUMNS FROM tbl_name [FROM db_name]︰列出資料表的欄位,同 SHOW FIELDS FROM tbl_name [FROM db_name],DESCRIBE ...
SQL%and_wildcard characters. This might cause some confusion when you try to display the columns for a table with a_in the name, because in this case,mysqlshowshows you only the table names that match the pattern. This is easily fixed by adding an extra%last on the command line as a...
SHOW DATABASES︰列出 MySQL Server 上的数据库。 SHOW TABLES [FROM db_name]︰列出数据库中的表。 SHOW TABLE STATUS [FROM db_name]︰列出数据库的表信息,比较详细。 SHOW COLUMNS FROM tbl_name [FROM db_name]︰列出表的列信息,同 SHOW FIELDS FROM tbl_name [FROM db_name],DESCRIBE tbl_name [col...
3、SHOW COLUMNS 显示在一个给定表中的各列的信息(等同于DESC) mysql> SHOW COLUMNS FROM zjf.a1; +---+---+---+---+---+---+ | Field | Type | Null | Key | Default | Extra | +---+---+---+---+---+---+ | id | int(11) | NO | | NULL | | +---+---+---+-...
Re: MYSQL syntax to show columns correctly Peter Brawley May 06, 2021 11:22AM Sorry, you can't reply to this topic. It has been closed. Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily ...