MySQL的dd表是用来存放表结构和各种建表信息的,客户端建的表都存在mysql.table和mysql.columns表里,还有一个表mysql.column_type_elements比较特殊,用来存放SET和ENUM类型的字段集合值信息。看一下下面这张表的mysql.columns表和mysql.column_type_elements信息。为了缩短显示长度,
INSERT INTO语句用于将新行插入到表中。基本的语法格式如下: INSERTINTO表名(列1,列2,列3,...)VALUES(值1,值2,值3,...); 1. 2. 例如,如果我们有一个名为Users的表,其结构如下: 我们可以使用以下 SQL 语句将新用户插入到Users表中: INSERTINTOUsers(UserID,UserName,Age)VALUES(3,'Charlie',28); 1...
SELECT DISTINCT on one column, with multiple columns returned Select event where date >= today SELECT INTO temporary table with unique key? SELECT not DISTINCT records in Table Select with from database with a list of parameters Selecting columns from a datatable for a dataview.. ...
taos> CREATE TABLE meters(ts TIMESTAMP, current FLOAT, voltage INT, phase FLOAT) TAGS(location BINARY(30), groupId INT);Query OK, row(s) affected (0.008245s)taos> SHOW STABLES; name | created_time | columns | tags | tables |=== meters ...
You can insert multiple columns from multiple columns: INSERT INTO table_a (col1a, col2a, col3a, …) SELECT col1b, col2b, col3b, … FROM table_b; 2. Insert some rows from another table. You can add some conditions before inserting to limit the results: ...
INSERT [INTO] table_name [column_list] VALUES default values values_list INSERT INTO Customers (CustID, CustName) VALUES ('Cust1', 'Smith Company'); INSERT 命令之后必须跟着你想添加数据的表的名称。INTO关键字是可选的。但是,INTO使得这个语句更加可读。在这个例子中,输入了两个信息字段。在VALUES行...
INSERT INTO Syntax INSERTINTOtable_name(column1, column2, column3, ...)VALUES(value1, value2, value3, ...); Here, table_nameis the table where the new row(s) are inserted column1, column2, column3, ...are the columns where the values are to be inserted ...
Specifies a set of columns that are included, along with the columns oftable-nameorview-name, in the result table of the INSERT statement when it is nested in the FROM clause of the outer fullselect that is used in a subselect, a SELECT statement, or in a SELECT INTO statement. The in...
FILESTREAM, FileTable & BLOB Indexes SQL Graph Sequence numbers Service Broker Spatial data Stored procedures Tables Tables Manage Create Delete Duplicate Rename View Table Definition View the dependencies Add Columns Delete Columns Rename Columns
INSERT INTO [<columnstore index>] SELECT col1 /* include actual list of columns in place of col1*/ FROM [<Staging Table>] 此命令以类似于 bcp 或批量插入的方式将数据加载到列存储索引,但操作是以单批完成的。 如果临时表中的行数 < 102400,行将加载到增量行组;否则,行将直接...