data_type- column data type max_length- data type max length precision- data type precision Rows One rowrepresents one table column Scope of rows:all columns in all tables in a database Ordered byschema, table name, column id Sample results You could also get this Get this interactive HTML...
Alias all columns in a given table Alias column with variable value in SQL Script All MonthNames and Month numbers in sql server All queries combined using a UNION, INTERSECT or EXCEPT operator must have an equal number of expressions in their target lists. all the events in the workload ...
out.println("传入的是全部列:" + allColumns); //判断表达式是否是列 } else if (expression instanceof Column) { System.out.println("查询值:" + ((Column) expression).getColumnName()); } } // System.out.println("表名:" + tableList); Expression where = plain.getWhere(); if (where ...
Suppose we are using the Sakila sample database in MySQL to show all the tables within the database without any additional filtering. We can use a query as shown in the following: mysql> show tables; The command returns a list of all tables in the current database. An example output is...
其中Collection<String>参数在几种分片策略中使用一致,在分库时值为所有分片库的集合databaseNames,分表时为对应分片库中所有分片表的集合tablesNames;PreciseShardingValue为分片属性,其中logicTableName为逻辑表,columnName分片健(字段),value为从 SQL 中解析出的分片健的值。
表格選項是一個鍵值對,您可以在執行CREATE TABLE時進行初始化。 您無法SET或UNSET資料表選項。 TBLPROPERTIES 在新數據表或檢視中設定一或多個數據表屬性。 您可以使用資料表屬性來標記數據表,其中包含 SQL 未追蹤的資訊。 語法 TBLPROPERTIES ( { property_key [ = ] property_val } [, .....
LIST SHOW ALL IN SHARE SHOW CATALOGS SHOW COLUMNS SHOW CONNECTIONS SHOW CREATE TABLE SHOW CREDENTIALS SHOW DATABASES SHOW FUNCTIONS SHOW GROUPS 顯示位置 SHOW PARTITIONS SHOW PROVIDERS SHOW RECIPIENTS SHOW SCHEMAS SHOW SHARES SHOW SHARES IN PROVIDER SHOW TABLE EXTENDED SHOW TABLES SHOW TABLES DROPPED SHO...
SQL 数据定义语言(Data Definition Language,DDL) 用来创建或删除数据库以及表等对象,主要包含以下几种命令: DROP:删除数据库和表等对象 CREATE:创建数据库和表等对象 ALTER:修改数据库和表等对象的结构 数据操作语言(Data Manipulation L
SQL is a statically typed language: the query must list the result columns upfront. To pivot a table with unknown or dynamic attributes, multisets or document types (XML, JSON) can be used to represent a key-value store in a single column. See conforming alternatives to listagg: document ...
IN INNER INTERVAL IS JOIN LEFT LIKE LIMIT MATCH MINUTE MINUTES MONTH NATURAL NOT NULL NULLS ON OR ORDER OUTER RIGHT RLIKE QUERY SECOND SECONDS SELECT SESSION TABLE TABLES THEN TO TRUE TYPE USING WHEN WHERE WITH YEAR DDL语句 DDL语句,即数据定义语句(Data Definition Languages)。其关键字包括:CREATE...