其中,column_name是要搜索的列名,search_string是要搜索的字符串。 以下是使用CONTAINS()函数的示例: 假设有一个名为products的表,其中包含两个列:id和name。我们想要从表中搜索所有包含字符串'apple'的产品。可以使用如下的SQL查询: ``` SELECT * FROM products WHERE CONTAINS(name, 'apple') ``` 这将返回...
SELECTCOUNT(DISTINCTCountry)FROMCustomers; 此语句使用COUNT函数来计算不同国家的数量。 请注意,某些数据库系统可能不支持COUNT(DISTINCT column_name)这种写法。在这种情况下,您可以使用子查询来达到相同的目的。 SQL WHERE 关键字 SQL的WHERE子句用于筛选数据库表中的记录。它允许您提取只满足指定条件的记录。以下是基...
Before we dive into the various methods, we can attempt to establish a common syntax that can summarize how the string contains the operation works in SQL. Take a look at the following example: SELECT * FROM table_name WHERE column_name CONTAINS 'substring_to_search'; You will notice that ...
newArrayList(); for (SelectItem item : selectItems) { SingleColumn column = (SingleColumn) item; fieldNames.add(((Identifier) column.getExpression()).getValue()); } Assert.assertEquals("name,age", String.join(",", fieldNames)); Optional<Expression> whereExpr = specification.getWhere(); ...
数据库中查询数据,当在PL/SQL中使用SELECT语句时,要与INTO子句一起使用,查询的 返回值被赋予INTO子句中的变量,变量的声明是在DELCARE中.SELECT INTO语法如下: SELECT [DISTICT|ALL]{*|column[,column,...]} INTO (variable[,variable,...] |record) FROM {table|(sub-query)}[alias] WHERE... PL/SQL ...
COLUMN INDEX SCHEMA COMMIT INNER SECURITYAUDIT COMPUTE INSERT SELECT CONSTRAINT INTERSECT SESSION_USER CONTAINS INTO SET CONTAINSTABLE IS SETUSER CONTINUE JOIN SHUTDOWN CONVERT KEY SOME CREATE KILL STATISTICS CROSS LEFT SYSTEM_USER CURRENT LIKE
CONTAINS(column,string) column-- the column to search. string-- the string or expression to search for. More Examples # CONTAINS. Multiple values. Problem:Find customers named Paolo, José, or Maria. SELECT*FROMCustomerWHERECONTAINS(FirstName,'Paolo OR José OR Maria') ...
SELECT 语句可以直接检索表中所有信息,即检索所有的列。 SELECT * FROM `table_name`; 1. 使用SELECT DISTINCT 查询不同行 DISTINCT关键字。 SELECT DISTINCT `column_name` FROM `table_name` 1. 2. 使用SELECT WHERE 对行进行筛选过滤 SELECT WHEREWHERESELECT WHERE语句检索表数据时,需要给出检索的表名 (tabl...
(jsonSelectSyntax.notEmpty(IdUtil.fastUUID())); } } } else { String fieldName = null; if (leftExpr instanceof SQLIdentifierExpr) { SQLIdentifierExpr sqlIdentifierExpr = (SQLIdentifierExpr) leftExpr; fieldName = sqlIdentifierExpr.getName(); } else if (leftExpr instanceof SQLPropertyExpr)...
1055(42000): SELECT list is not in GROUP BY clause and contains nonaggregated column 原因与解决方案 该报错主要是因为sql_mode参数被修改导致: 原因一:用户修改sql_mode参数导致GROUP BY的语法不合规 原因:用户修改了sql_mode参数,添加了ONLY_FULL_GROUP_BY条件,导致GROUP BY的语法不符...