GO-- Create npub_info table in pubs database. Borrowed from instpubs.sql.USE pubs GOCREATETABLEnpub_info ( pub_idchar(4)NOTNULLREFERENCESpublishers(pub_id)CONSTRAINTUPKCL_npubinfoPRIMARYKEY CLUSTERED, pr_info ntextNULL) GO-- Fill the pr_info column in npub_info with international data.R...
USE pubs SELECT au_lname, SUBSTRING(au_fname, 1, 1)FROM authors ORDER BY au_lname 下⾯是结果集：au_lname --- - Bennet A Blotchet-Halls R Carson C DeFrance M
# 选择数据库mycursor=mydb.cursor()mycursor.execute("USE yourdatabase")# 选择数据表mycursor.execute("SELECT * FROM yourtable") 1. 2. 3. 4. 5. 6. 3. 编写SQL查询语句,使用substring函数截取字符串 接下来,我们需要编写SQL查询语句,并使用substring函数来实现字符串的截取。假设我们的数据表中有一...
SQL IF EXISTS (SELECTtable_nameFROMINFORMATION_SCHEMA.TABLESWHEREtable_name ='npub_info')DROPTABLEnpub_info; GO-- Create npub_info table in pubs database. Borrowed from instpubs.sql.USEpubs; GOCREATETABLEnpub_info ( pub_idCHAR(4)NOTNULLFOREIGNKEYREFERENCESpublishers (pub_id)CONSTRAINTUPKCL_...
SQL IF EXISTS (SELECTtable_nameFROMINFORMATION_SCHEMA.TABLESWHEREtable_name ='npub_info')DROPTABLEnpub_info; GO-- Create npub_info table in pubs database. Borrowed from instpubs.sql.USEpubs; GOCREATETABLEnpub_info ( pub_idCHAR(4)NOTNULLFOREIGNKEYREFERENCESpublishers (pub_id)CONSTRAINTUPKCL_...
jdbc:mysql://172.17.0.1:3306/XX?characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=false&allowPublicKeyRetrieval=true 1. 服务器内部连接数据库 实例 例子1 在本例中,我们将使用 substring() 从字符串中提取一些字符: var str="Hello world!" document...
I started SQL recently as a beginner i came across the above problem. the book i referring is using MySQL and i want to know how can i do the following in SQL Server This is the query as per the example in the book SELECT SUBSTRING_INDEX(location, ',', 1) FROM my_contacts; ...
I started SQL recently as a beginner i came across the above problem. the book i referring is using MySQL and i want to know how can i do the following in SQL Server This is the query as per the example in the book SELECT SUBSTRING_INDEX(location, ',', 1) F...
The SUBSTRING function is used to extract a part of a string. This function is available in both MS SQL Server and MySQL. The MySQL SUBSTRING function provides more functionality than MS SQL Server SUBSTRING function. In MySQL you can also use SUBSTR function which is Synonym for SUBSTRING fun...
Borrowed from instpubs.sql. USE pubs; GO CREATE TABLE npub_info ( pub_id char(4) NOT NULL REFERENCES publishers(pub_id) CONSTRAINT UPKCL_npubinfo PRIMARY KEY CLUSTERED, pr_info ntext NULL ); GO -- Fill the pr_info column in npub_info with international data. RAISERROR('Now at the...