SQL: select * from a left inner join b on a.a=b.b right inner join c on a.a=c.c inner join d on a.a=d.d where ... 说明:得到表中最小的未使用的ID号 SQL: SELECT (CASE WHEN EXISTS(SELECT * FROM Handle b WHERE b.HandleID = 1) THEN MIN(HandleID) + 1 ELSE 1 END) as...
表达式“x IN (SELECT y ...)”与“x = y”的处理方式一样,目的是为了确定校对序列。用在“x IN (y z ...)”格式表达式上的校对序列,就是 x 的校对序列。 ORDER BY 子句是一个 SELECT 语句的一部分,其规则是,可使用 COLLATE 操作符为 SELECT 语句分配一个校对序列,在这种情况下,特定的校对函数被用...
--29、查询出king所在部门的部门号\部门名称\部门人数select t1.deptno,t2.dname,count(*)from emp t1,dept t2where t1.deptno=t2.deptno and t1.deptno=(select deptno from emp where ename='KING')group by t1.deptno,t2.dname
id="app"> <el-select v-model="mineStatus" placeholder="请选择" multiple @change="selectCh...
select S.SId,S.Sname,count(SC.Cid),sum(SC.score) from Student as S LEFT JOIN SC on S.SId=SC.SId group by S.SId; select S.SId,S.Sname from Student as S where exists (select * from SC where SC.SId=S.SId); 5.查询「李」姓老师的数量 答案: select count(*) from Teacher where...
When you instantiate this object, you pass in the filename for the database file. The constructor then either opens the file if it exists or creates it if it isn't present.The following code shows an example:C# Copy using SQLite; ... string filename = ... SQLiteConnection conn = ...
log('SELECT error: ' + error.message); }); }); To populate a database using the SQL batch API: db.sqlBatch([ 'CREATE TABLE IF NOT EXISTS DemoTable (name, score)', [ 'INSERT INTO DemoTable VALUES (?,?)', ['Alice', 101] ], [ 'INSERT INTO DemoTable VALUES (?,?)', ['...
log('SELECT error: ' + error.message); }); }); Using plugin-specific API calls To populate a database using the SQL batch API: db.sqlBatch([ 'CREATE TABLE IF NOT EXISTS DemoTable (name, score)', [ 'INSERT INTO DemoTable VALUES (?,?)', ['Alice', 101] ], [ 'INSERT INTO ...
constsqlite3=require('sqlite3').verbose();constdb=newsqlite3.Database(':memory:');db.serialize(()=>{db.run("CREATE TABLE lorem (info TEXT)");conststmt=db.prepare("INSERT INTO lorem VALUES (?)");for(leti=0;i<10;i++){stmt.run("Ipsum "+i);}stmt.finalize();db.each("SELECT ro...
Starting with version 4.0.0 the encryption extension allows to select the cipher scheme at runtime. Currently the following encryption schemes are supported: AES 128 Bit CBC - No HMAC (wxSQLite3) AES 256 Bit CBC - No HMAC (wxSQLite3) ChaCha20 - Poly1305 HMAC (sqleet) (default) AES 256...